Envelope Blogs

The envelope is the first impression, not the card. When a printed invitation arrives in someone's mailbox, they hold the envelope before they ever see the card. The weight, the color, whether it is hand-addressed or printed, whether there is a wax seal or a logo on the back flap: all of this creates an impression before anything comes out. A plain white envelope with a stick-on return address label undoes a lot of the work that a beautifully printed card is trying to do. A colored envelope or a custom printed envelope extends the design all the way to the outside of the piece, where the first impression actually happens.

Most invitation suites weigh more than one stamp covers. A full suite, which includes the main invitation card, an RSVP card, a return envelope, and any insert cards, regularly exceeds one ounce. One Forever stamp covers one ounce at 78 cents. Add a second insert card or use heavier cardstock and you are almost certainly at two ounces, which costs $1.07. Take one fully assembled, sealed sample suite to a post office counter before you buy stamps for the full run. Finding out pieces are under-stamped after 150 of them are already in blue collection boxes is not a fun experience.

Square envelopes automatically cost 49 cents more per piece. A standard A7 rectangular envelope mails at First-Class letter rate. A square envelope has an aspect ratio of 1:1, which falls below the USPS minimum of 1.3. Square envelopes are classified as non-machinable and charged a 49-cent surcharge on every single piece, regardless of weight. On 150 invitations, that is $73.50 in postage you did not plan for. If you want a square card, enclose it inside a rectangular envelope and the outer piece mails at the standard rate.

Wax seals get crushed in sorting machines. Wax seals run through automated postal processing equipment arrive cracked and often arrive destroyed. If wax seals are part of your invitation design, request hand-cancellation at the post office counter when you drop off the envelopes. This is free and ensures the seals go through the system without being mechanically pressed and cracked.

Self seal saves more time than you expect on large runs. Sealing 150 invitation envelopes plus 150 pre-stamped RSVP return envelopes by gum flap requires moisture activation on 300 separate pieces. Self seal envelopes with a peel-and-press strip seal on contact with no moisture. The time difference on a run of 150 or more is real, and the consistency is better too. A gum flap that is not properly moistened can come unsealed in transit. A properly pressed self seal envelope does not.

Order 10 to 15 percent more envelopes than your mailing list count. Addressing errors, ink smears, last-minute additions to the list, and pieces that come back undeliverable and need to be resent: all of these eat into your envelope supply after you have already addressed and sealed most of them. Running out of envelopes after the addressing stage is an expensive problem. Running out of a specific colored or custom envelope that takes 7 to 10 days to reorder is worse.

Choosing the right envelope when you go print

5 x 7 inch invitation and announcement cards:
A7 envelope (5.25 x 7.25 inches). The US standard for wedding invitations, graduation announcements, formal event invitations, and holiday photo cards. Mails at First-Class letter rate. One Forever stamp covers a single card at one ounce. Full suites with inserts almost always need two-ounce postage at $1.07. Available in white, colored wove and starburst, and self seal formats.

4 x 6 photo cards and smaller casual cards:
A6 envelope (4.75 x 6.5 inches). Holiday photo cards, save-the-dates, and casual greeting cards in 4 x 6 format. Mails at First-Class letter rate. Check the full size catalog for all card-to-envelope pairings.

RSVP and response cards (4.25 x 5.5 inch):
A2 envelope (4.375 x 5.75 inches). The correct return envelope for standard RSVP cards. Pre-address and pre-stamp these before enclosing them in the outer invitation envelope. Guests who receive a pre-stamped return envelope respond at significantly higher rates than guests who have to source their own envelope and stamp.

Standard business holiday cards:
#10 envelopes for business correspondence accompanying a card or letter. For business holiday cards sized at 4.25 x 5.5 inches, an A2 is the correct match. For colored business mailings, wove and starburst colored envelopes in #10, #9, and 6 x 9 formats are available.

Colored envelopes for maximum visibility:
A colored envelope in a stack of white mail gets noticed first. For event invitations, nonprofit fundraising appeals, and business holiday card programs where standing out in the mail pile is part of the intent, colored envelopes do work that no label applied to a plain white envelope can replicate. The 55 percent of consumers who prefer personalized, unique correspondence over generic options: the colored envelope signals that preference is being served before the card even comes out.

Custom printed envelopes with logo and return address:
Printed envelopes with your organization's name, logo, and return address pre-printed on the stock. For businesses, law firms, nonprofits, and any organization mailing holiday cards or branded correspondence at volume, this eliminates the return address label step permanently. PDF proof before production, 7 to 10 business day turnaround.

Online invitation etiquette: what actually matters

Choosing digital does not mean etiquette stops applying.

Lead time still matters. For casual events, two to three weeks is fine. For formal or milestone events, four to six weeks. For weddings using digital invitations, the standard six to eight week timeline still applies. The fact that digital sends instantly does not mean it should be sent at the last minute.

Platform presentation signals formality. A well-designed digital invitation through a dedicated platform reads as intentional and considered. A JPEG texted in a group chat reads as an afterthought. For any event with more formality than a casual gathering, use a proper digital invitation platform with a real design rather than a shared image.

Include every logistical detail. Date, time, full venue address, RSVP deadline, dress code, parking notes, and any information guests actually need. Digital invitations can carry more information than paper because space is not a constraint. Use that capacity. Do not make guests go searching for basic logistics.

Follow up directly with people who matter most. A digital invitation sent to elderly relatives or anyone you know is not reliably online should be followed up with a direct phone call confirming they received it and have the details. The digital platform delivers the information. The phone call confirms receipt with the people where missing the invitation would matter most.

Match the design to the formality. A casual birthday can use animated templates and bright colors. A formal dinner invitation done digitally should use restrained typography, a calm palette, and language that reflects the significance of the occasion. The design signals the formality of the event before the recipient reads the wording.

Cost comparison: what you actually spend on each format

The cost difference is real. Understanding it helps make the decision clearly.

Digital invitation costs:
Free platforms with limited features cost nothing. Paid platforms typically run $15 to $40 per event. Premium templates add $10 to $30. Total realistic cost for 100 to 150 guests: $0 to $75 depending on the platform and features.

Printed invitation costs for 100 to 150 guests:
Design: $0 if handled in-house, $150 to $500 for a professional designer. Digital flat printing on basic cardstock: $50 to $200 for the print run. Premium options (letterpress, foil, thermography): $500 to $2,000 for the same quantity. Envelopes: $15 to $50 depending on size, color, and closure type. Postage outgoing at $0.78 to $1.07 per piece: $117 to $160. RSVP return postage for pre-stamped envelopes: $78 to $117. Total typical range: $260 to $650. Premium suites with specialty printing and calligraphy: $1,500 to $3,000 or more.

The honest takeaway on cost:
Digital is cheaper for any event where that is the primary concern. For formal occasions, the printed invitation suite is typically a planned budget line because the physical piece is part of what makes the event feel significant. The investment in print is not about paying more for the same result. It is about communicating something with the format itself that digital cannot communicate.

What makes Business Envelopes different for printed invitation mailings

Business Envelopes has supplied commercial envelopes to US businesses, event planners, nonprofits, and individuals since 1997. Here is what matters specifically for invitation and greeting card mailings.

Every standard invitation size in one catalog. A2, A6, A7, A9, #6 3/4, #9, #10, 6 x 9, 9 x 12. White, colored, self seal, custom printed. All from one supplier, free ground shipping, no minimums.

Colored envelopes that actually get noticed. Wove and starburst colored envelopes in multiple sizes. For holiday card campaigns, event invitations, and fundraising mailings where the outer envelope is part of the first impression, color changes how the piece is received before it is touched.

Self seal in every major format. Self seal envelopes in peel-and-seal and flip-and-stick closures across all commercial sizes. For invitation runs of 50 or more, self seal saves real time and produces more consistent sealing than gum flap activation under time pressure.

Custom printed envelopes that carry the brand. Printed envelopes with logo and return address pre-printed on the stock. For organizations mailing holiday cards or branded correspondence at any consistent volume, this eliminates the return address label step on every single outgoing piece.

Free shipping, no minimums. Order the exact quantity your mailing needs plus the 10 to 15 percent buffer. One box or a full case, shipping is free to the contiguous 48 states. Blank stock ships same or next business day. Custom printed stock ships 7 to 10 business days from proof approval.

Frequently asked questions

Are digital invitations acceptable for formal events?
Yes, for most of them. A thoughtfully designed digital invitation sent through a dedicated platform works for most formal events, including milestone birthday parties, formal showers, and many corporate events. For traditional weddings and black-tie galas specifically, many guests still expect a physical piece, and the format itself carries meaning at that level of formality.

Which is better, online invitations or printed?
Depends on the occasion, the guest list, and the relationship. Digital wins on speed, cost, RSVP management, and flexibility. Printed wins on formality, keepsake value, and communicating significance. The hybrid approach (digital save-the-date plus printed invitation, or printed card with digital RSVP) often works best for formal events.

What size envelope fits a 5 x 7 invitation card?
An A7 envelope (5.25 x 7.25 inches). Check the complete size catalog for every card-to-envelope pairing from A2 through A9.

How much does it cost to mail printed invitations?
A standard rectangular envelope at one ounce costs 78 cents (one Forever stamp). Most full suites with multiple inserts weigh over one ounce and cost $1.07 at the two-ounce rate. Square envelopes add 49 cents per piece. Always weigh a complete sealed sample at a post office counter before buying stamps for the full run.

Do physical greeting cards still matter?
Yes. Two out of three Americans prefer to receive a physical card over a digital one, including most millennials and Gen Z. About 80 percent of people keep physical cards that mark significant milestones. Small businesses mail approximately 150 million physical holiday cards every year. The physical card serves a specific function that digital cannot replace: permanence, presence, and the signal of personal investment.

When should I use colored envelopes?
When standing out in a mail pile is part of the design intent. A colored envelope is visible in a stack of white mail before the recipient picks it up. For event invitations, holiday campaigns, and fundraising appeals where the piece must get noticed, envelope color does work that a label on a plain white envelope cannot.

Are self seal envelopes good for invitation mailings?
Yes, especially for runs of more than 50 pieces. Self seal envelopes seal on contact with no moisture. The seal is consistent on every piece. For a mailing of 150 invitations plus 150 pre-stamped return envelopes, self seal eliminates 300 individual gum-flap activation steps from the assembly process.

Home › Envelope Guides › How to Store Envelopes

Quick answer: Store envelopes at 65 to 85 degrees Fahrenheit and 35 to 65 percent relative humidity, in sealed boxes placed on a raised surface off the floor and away from direct sunlight. Gum flap envelopes last 12 to 18 months under these conditions. Peel-and-seal envelopes last approximately 12 months. Flip-and-stick envelopes have the shortest shelf life at 6 to 12 months. Always use oldest stock first and run a manual quality check before any large batch mailing.

Most offices never think about how to store envelopes until something goes wrong. A gum flap batch that will not seal. A stack of peel-and-seal envelopes where the adhesive feels weak. Yellowed paper stock that jams the printer. Every one of these failures has a storage cause, and every one is preventable.

The Envelope Manufacturers Association publishes specific storage standards for commercial envelope stock. This guide translates those standards into practical steps for any office managing envelope inventory, whether you keep a box on the shelf or a pallet in the storeroom. The requirements differ slightly by seal type, and knowing those differences prevents the most common storage failures before they become a problem during a mailing run.

 

Ideal Storage Conditions for Envelopes

Two environmental factors determine how long envelope stock stays usable in storage: temperature and relative humidity (RH). Both affect the paper and the adhesive differently, and both need to be within the correct range to protect the stock reliably.

Factor	Recommended Range	What Happens Outside This Range
Temperature	65 to 85 degrees Fahrenheit	Above 85°F: adhesive degrades faster. Below 65°F: paper becomes brittle, gum activates more slowly
Relative Humidity (RH)	35 to 65 percent RH	Above 65% RH: gum pre-activates, paper absorbs moisture and warps. Below 35% RH: gum dries out and loses tack

Source: Envelope Manufacturers Association (EMA) storage guidelines for commercial envelope stock.

Most climate-controlled offices in the continental United States naturally fall within these ranges during working hours. The risk areas are unconditioned storage rooms, basement stock areas, garages, and any space where temperature or humidity fluctuates with the seasons or with warehouse HVAC cycling. If envelope stock is stored anywhere other than a fully conditioned office or stockroom, verify that the conditions in that specific space fall within the EMA range before storing bulk quantities there.

 

How to Store Envelopes: Physical Placement Rules

Beyond temperature and humidity, physical placement directly affects whether stored envelopes arrive at the mailing station in usable condition.

 

Store boxes on a raised surface, never directly on the floor

Concrete and tile floors transmit moisture upward even when the surface looks and feels dry. A box of envelopes sitting on a warehouse floor can absorb enough moisture through the cardboard in a few weeks to pre-activate gum flap adhesive or cause paper to warp at the corners. Use wooden pallets, metal shelving, or any raised surface that breaks contact between the box and the floor. A clearance of even 4 to 6 inches is enough to prevent floor moisture transfer.

 

Store envelopes resting on edge, not flat

Envelopes inside a box are designed to rest on edge, with the long dimension vertical. Laying boxes flat creates a stacking pressure on the envelope faces that can cause adhesive surfaces to press against each other over time, especially in warm conditions. Boxes stored on edge distribute the weight along the envelope edges rather than the faces.

 

Keep boxes sealed until needed

The manufacturer's box provides the first layer of humidity protection. An open box exposes the envelopes inside to whatever ambient humidity exists in the storage area. Keep boxes sealed with their original closures or with tape until you are ready to use the contents. Once a box is opened, use the remaining contents promptly rather than leaving them exposed.

 

Keep stock away from exterior walls, windows, and direct sunlight

Exterior walls transmit outdoor temperature and humidity fluctuations into the storage space. Windows create localized heat zones from direct sunlight. UV light from both sunlight and fluorescent lighting accelerates yellowing in white paper stock and degrades latex adhesive in self-seal formats. Store envelope boxes in an interior position, away from windows and exterior walls.

 

Allow stored stock to acclimate before use

Envelopes moved from a cold or unconditioned storage space to a warm mailing room need time to adjust. Moving cold stock directly to a warm, humid room causes condensation to form on the paper surface, which can pre-activate gum flap adhesive and cause paper to warp before the mailing run begins. Move stock from cold storage to the work area at least 24 to 48 hours before the mailing date to allow gradual temperature and humidity equalization.

Critical: do not store envelopes in unconditioned areas A garage, attic, unconditioned basement, or outdoor storage unit is not a suitable envelope storage location in most US climates. Summer temperatures in enclosed spaces routinely exceed 100 degrees Fahrenheit, which will degrade adhesive on self-seal formats within weeks. Winter temperatures in unconditioned spaces fall below 65 degrees Fahrenheit, which hardens paper fibers and causes gum adhesive to become sluggish. Store envelope stock only in climate-controlled spaces.

Envelope Shelf Life by Seal Type

Shelf life is not a single number that applies to all envelopes equally. It varies by seal type because each closure format uses a different adhesive chemistry with different degradation characteristics. Understanding this prevents a common and costly mistake: buying bulk stock of a self-seal format and discovering months later that the adhesive has weakened before the stock was used.

Seal Type	Shelf Life (Ideal Conditions)	Primary Risk	Storage Priority
Gum flap (remoistenable)	12 to 18 months	Gum dries out below 35% RH; pre-activates above 65% RH	Best choice for long-term bulk storage
Peel-and-seal (pressure-sensitive)	Approximately 12 months	Release liner protects adhesive until use; adhesive weakens after 12 months	Good for bulk if used within 12 months of manufacture
Flip-and-stick (latex cohesive)	6 to 12 months	Exposed latex adhesive degrades faster in heat and humidity	Order only what you will use within 6 months
Clasp (metal clasp, gum flap)	12 to 18 months (paper and gum)	Paper yellows with age; gum dries out same as standard gum flap	Same as gum flap; clasp mechanism does not degrade

 

Gum flap: the best bulk storage format

Gum flap envelopes use a remoistenable adhesive strip that only activates with the addition of water. Because no activation occurs until moisture is deliberately applied, gum flap stock is inherently more tolerant of the occasional humidity variation than self-seal formats. The main storage risks are humidity above 65 percent RH, which can cause partial pre-activation, and storage below 35 percent RH, which dries out the gum and makes it difficult to activate at the mailing stage. For any office that orders in large quantities and rotates stock slowly, gum flap is the seal type with the widest storage tolerance. See regular envelopes for the full gum flap range.

 

Peel-and-seal: good for bulk with a 12-month window

Peel-and-seal envelopes use a pressure-sensitive adhesive covered by a release liner. The liner keeps the adhesive completely inactive until deliberately removed, which means peel-and-seal envelopes do not pre-seal in storage and are not sensitive to humidity in the same way gum flap envelopes are. The shelf life limitation is adhesive degradation over time. After approximately 12 months from the manufacturing date, the pressure-sensitive adhesive weakens and may not produce a reliable bond even when the liner is removed and the flap is pressed correctly. Order quantities your operation will use within 12 months and check the manufacturing date on boxes when ordering from stock. See self seal envelopes for all peel-and-seal formats.

 

Flip-and-stick: order only what you will use quickly

Flip-and-stick envelopes use a latex cohesive adhesive with an exposed surface on the envelope body. Because the adhesive surface is not protected by a liner, it is more vulnerable to environmental exposure than peel-and-seal. Heat and humidity accelerate latex degradation significantly. The practical shelf life is 6 to 12 months under ideal conditions, and shorter in warm storage areas. Flip-and-stick is the fastest seal type for high-volume hand sealing, but it is the wrong choice for any operation that orders seasonally and stores for months at a time. See all self-seal formats at Self Adhesive Envelopes: Types, Uses and How to Choose.

 

How to Store Window Envelopes

Window envelopes require the same temperature and humidity conditions as plain envelopes, but they have one additional storage vulnerability: the poly-film window patch.

The window film is bonded to the inside of the envelope using a hot-melt adhesive applied along the edges of the die-cut opening. In extended storage beyond 18 months, or with extreme temperature cycling in an unconditioned space, the hot-melt adhesive can become brittle, cause film edges to lift slightly, or increase static buildup on the film surface. Static causes window envelopes to stick to each other in the box and can interfere with automated inserter feeding.

For window envelope stock, the same EMA conditions apply (65-85°F, 35-65% RH), and the same 12 to 18 month shelf life applies depending on the seal type. The additional guidance is to avoid temperature cycling. Consistent temperature is more important for window stock than for plain envelopes. See all window formats at window envelopes.

 

FIFO Stock Rotation: Using Oldest Stock First

First In, First Out (FIFO) is the standard stock rotation method for envelope inventory. When new stock arrives, place it behind or under existing stock so the oldest boxes are always accessed first. This prevents a common failure mode where a new shipment gets stacked on top of older stock, and the older stock sits unused until it has degraded past its shelf life.

 

Pre-Run Quality Check: How to Tell if Stored Envelopes Have Gone Bad

Before every large mailing run, pull 5 to 10 envelopes from the stock you plan to use and run a manual quality check. This takes two minutes and prevents discovering a stock problem halfway through a 500-piece billing run.

 

Quality check for gum flap envelopes

1. Moisten the gum strip on the flap using a damp sponge or finger.
2. Press the flap closed and hold for 3 seconds.
3. Try to pull the flap open. The bond should resist with paper-tearing strength.
4. If the flap peels open cleanly without tearing the paper, the gum has dried out and the stock needs to be replaced.

 

Quality check for peel-and-seal envelopes

1. Peel the release liner from the adhesive strip on the flap.
2. Press the flap down firmly and hold for 2 seconds.
3. The bond should be immediate and firm.
4. If the adhesive feels tacky but the flap peels open without resistance, the pressure-sensitive adhesive has weakened past its useful life.

 

Quality check for flip-and-stick envelopes

1. Fold the flap tab down onto the adhesive panel on the envelope body and press firmly.
2. Hold for 2 seconds, then try to pull the flap open.
3. A good bond will tear the paper before it releases the seal.
4. A degraded bond will release cleanly , the surfaces separate without resistance. Replace the stock.

 

Visual quality check for all formats

• Paper yellowing: White envelopes that have turned noticeably yellow or cream have been stored too long. Yellowed paper is also more brittle and prone to tearing during machine processing.
• Corner brittleness: Flex a corner of the envelope. If it cracks rather than bends cleanly, the paper has dried out from age or low humidity exposure.
• Window film lifting: On window envelopes, run a finger along the edge of the film. Any lifted edge means the hot-melt adhesive has partially failed.

 

Common Storage Mistakes and How to Avoid Them

• Storing in an unconditioned space: The most common and damaging mistake. Garages, attics, and unconditioned basements expose stock to temperature and humidity extremes that shorten shelf life dramatically. Always use a climate-controlled space.
• Placing boxes directly on the floor: Floor moisture permeates cardboard. Always use pallets or shelving.
• Leaving opened boxes exposed: Once a box is opened, the remaining envelopes are exposed to ambient humidity. Use them promptly or reseal the box.
• Ordering flip-and-stick in bulk for slow-moving inventory: Flip-and-stick has a 6-month practical shelf life in most conditions. Ordering a 12-month supply creates a stock degradation problem by default. Match order quantity to usage pace for this seal type.
• Skipping FIFO rotation: New stock stacked on top of old stock guarantees that old stock ages past its shelf life. Always rotate oldest stock to the front.
• Moving cold stock directly to a hot mailing room: Temperature shock causes condensation on the paper. Acclimate stock gradually over 24 to 48 hours before use.

 

Why Business Envelopes for Envelope Stock

Business Envelopes has supplied commercial envelope stock to US businesses since 1997. Every format , gum flap, peel-and-seal, flip-and-stick, window, clasp, Tyvek , is stocked blank or custom-printed and ships same or next business day on blank orders. No minimum order applies, so you can order exactly what your operation will use within the appropriate shelf-life window for your seal type, without committing to surplus stock that risks degrading before use.

• No minimums on any order
• Free ground shipping to the contiguous 48 states
• Blank stock ships same or next business day
• All seal types stocked: gum flap, peel-and-seal, flip-and-stick
• Custom-printed orders ship within 7 to 10 business days from proof approval

See the full range at all sizes envelopes. For the complete guide to envelope sealing techniques by seal type, see How to Seal an Envelope: Every Method Explained Simply.

 

Compact standard for return address placement on small envelopes. Fits the upper-left corner of A2, A6, and #9 envelopes with minimal space used. Two to three lines at 8 point type. No room for a logo.

Standard address labels (1 x 2.625 in, Avery 5160)

The US standard for both return address and delivery address placement on #10 envelopes (4.125 x 9.5 inches). Fits cleanly in both positions. The most ordered label format for business correspondence.

Wide address labels (1.33 x 4 in, Avery 5162)

Better proportioned for larger catalog envelopes like 9 x 12 and 10 x 13. Fits a four-line address with company name, or a three-line address with a small logo alongside the text.

Envelope seal labels (1.5 in, 2 in, 2.5 in diameter circles)

Applied over the sealed flap of an envelope as a decorative closure element. Available in paper gloss, paper uncoated, clear vinyl, gold foil, and silver foil. Used for wedding invitations, graduation announcements, holiday cards, and any piece where visual presentation of the sealed envelope is part of the design.

Custom die-cut seal shapes

Monograms, logos, crests, and brand marks cut to a specific shape. More expensive than standard circle seals but more distinctive. For organizations or events where the brand element on the sealed flap is part of the overall design system.

The honest answer: label or printed envelope

Most label guides are written by label printers. They will always tell you to use a label. Here is the comparison they would never write.

When a label on an envelope is genuinely the right choice:

You are addressing variable recipients from a mailing list where each piece needs a different name and address. Mail merge labels are the practical solution when every address in the batch changes and a window envelope format does not fit your document layout.

You are using a specialty envelope (linen, laid, textured, or colored stock) where printing an address directly is impractical because the surface texture disrupts print quality.

You need a decorative envelope seal on an invitation or announcement. A custom circular or die-cut seal on the flap closure is a genuine design element, not a workaround.

You are including branded stickers inside outgoing packages as promotional inserts. Labels as package inserts have nothing to do with addressing and are their own separate decision.

When a printed envelope is better:

You send the same return address on every outgoing piece. Applying a return address label to 500 envelopes takes 15 to 25 minutes of real staff time per mailing run. A custom printed envelope with your return address and logo pre-printed on the stock takes zero additional time per piece from that point forward.

You send recurring invoices, statements, or billing correspondence. A window envelope eliminates both the label and the separate addressing step entirely. The address printed on your document shows through the window. No label, no envelope printing, no alignment check per piece.

You want your brand visible on the outer envelope before the recipient opens it. A custom printed envelope with your logo carries the brand from the moment the piece arrives in the mail pile. A return address label carries the return address. Those are not the same thing.

You mail at any consistent volume. At 100 pieces per mailing run, the combined labor of applying a return address label, a logo label, and an address label per piece adds up fast compared to pulling pre-printed envelopes from a box.

How labels and printed envelopes work together in real mailing programs

The best mailing programs use both, assigned to the right jobs.

A business mailing a monthly newsletter might use a custom printed #10 envelope with logo and return address pre-printed, combined with address labels for the recipient delivery address from a mail merge. The printed envelope handles branding. The label handles the variable address data. Each tool does what it is best at.

A nonprofit running a year-end fundraising appeal might use colored starburst envelopes for visual impact in the mail pile, pre-printed with the organization's return address, with recipient addresses printed directly on the envelope face via a merge print run. No labels anywhere in that workflow.

An event organizer mailing wedding invitations might use plain white A7 envelopes with guest addresses handwritten for formality, a circular logo seal on the back flap from a die-cut label batch, and a pre-printed return address on the upper-left front from a short label run. Three different tools, each doing the right job.

A law firm mailing contracts and legal filings might use Tyvek envelopes for durability, with address labels applied to the face, because running Tyvek through a laser printer is not advisable. The label is the right tool here precisely because the envelope material requires it.

Label printing methods: digital vs flexographic

The printing method determines your minimum order quantity, cost structure, and what the label looks like at different volumes.

Digital printing

No plates, no setup fees on most runs. Minimum orders as low as 100 to 250 labels at many printers. Per-unit cost is higher than flexographic at the same volume but much more economical for small quantities. Digital also supports variable data: every label in the run can have a unique QR code, serial number, or personalized element at no additional cost per variation. The right choice for test runs, product launches, short batches, and any design that changes frequently.

Flexographic printing

Uses physical printing plates, which add a setup cost of roughly $50 to $200 per color depending on the printer. Per-unit cost drops sharply at volume. The correct choice for established products ordering 5,000 or more labels per run where the design will not change often. Setup cost is spread across the full run, dropping the per-label cost well below what digital can achieve at scale.

Screen printing

Used for specialty inks: metallic, white on dark substrates, neon, and textured effects that standard four-color printing cannot produce. Higher cost and longer setup time. Only justified when the ink effect itself is the point of the label.

What to get right before you order: the design checklist

Most label reprints happen because of design errors discovered after production. Here is what to check before approving any proof.

Artwork at 300 DPI minimum at actual print size. A design that looks sharp on screen at 72 DPI will look soft and slightly blurry at label scale. Size and resolution are both checked at print dimensions, not screen preview size.

CMYK color mode, not RGB. Colors displayed on screen in RGB shift when converted to CMYK for printing. Colors that look vivid on screen can print muddy or dull. Supply artwork in CMYK. If your brand has Pantone color specifications, provide the PMS numbers for accurate matching.

Bleed area of 0.125 inches on all sides. Any design element that extends to the label edge must extend 0.125 inches beyond the trim line into the bleed area. Without bleed, a slight shift during cutting leaves a thin white border on one edge.

Safe zone 0.0625 inches inside the trim line. Keep all critical text and logos at least 0.0625 inches from the trim edge. Cutting variance can clip elements placed right at the edge.

Vector format for logos. A vector file (SVG, EPS, or AI) scales without quality loss. A JPEG or PNG logo can show compression artifacts at label printing resolution. Use vector wherever possible.

Order a physical sample before committing to a full run. Digital proofs show color and layout. They cannot show how the adhesive bonds to your specific surface, how the laminate looks on your actual material, or how the label sits on a real product. For any label being applied to a new surface type, a physical sample test is worth the time and small cost before running 5,000 units.

What makes Business Envelopes different in this conversation

Business Envelopes is not a label printer. What it offers is the other side of the equation: the envelope that the label goes on, or the printed envelope that replaces the label entirely.

Custom printed envelopes that eliminate the return address label step. Your logo and return address printed directly on the envelope stock. Available across every commercial size. PDF proof before production, 7 to 10 business day turnaround, artwork on file for every reorder. No more peeling and applying return address labels on every outgoing piece.

Colored envelopes that do visual work labels cannot. Wove solid-color and starburst pattern envelopes make the outer envelope itself a brand element. A label on a plain white envelope is an addition. A colored envelope is a different kind of piece from the moment it appears in a mail pile.

Self seal envelopes that remove the moisture step. Peel-and-seal and flip-and-stick closures across all commercial sizes. Combined with pre-printed return addresses and window formats, self seal can remove three separate manual steps from a mailing run.

Window envelopes that eliminate address labels permanently for recurring mail. Single and double window formats. The recipient address on your printed document shows through the window. No label, no separate addressing step, no per-piece verification. Compatible with QuickBooks, Xero, FreshBooks, Sage, and all major billing software formats.

Every envelope size the label decision ever touches. #10 envelopes for standard correspondence label applications. 9 x 12 catalog envelopes for flat document packages with larger format labels on the face. Tyvek envelopes for the specific applications where label-on-envelope is the right call because the material requires it.

Free ground shipping, no minimums. Every order ships free to the contiguous 48 states. Blank stock ships same or next business day. Custom printed stock ships 7 to 10 business days from proof approval.

Frequently asked questions 

What is the difference between a label and a sticker?
Labels are generally thinner (around 4 mil BOPP film), designed for product identification and applied from rolls in production. Stickers are typically thicker vinyl (around 8 mil), designed for promotional use and handled individually. Both use pressure-sensitive adhesive. The materials and intended uses differ more than the words do.

What material works for most product labels?
BOPP film is the most practical starting point. It is waterproof, flexible, accepts full-color printing, and takes gloss and matte laminates well. Paper works for dry indoor environments at lower cost. Vinyl is the choice for outdoor or high-contact applications. Polyester handles industrial and laboratory environments.

What is the difference between die-cut and kiss-cut?
Die-cut labels are cut through both the label material and the liner, producing individually finished standalone labels. Kiss-cut labels are cut through the label material only, leaving the liner intact around each label for easier batch handling. Die-cut is the finished single piece format. Kiss-cut is the sheet format where you peel as needed.

How many labels should I order?
Match the order quantity to your distribution plan plus a 10 to 15 percent buffer for waste and replenishment. Digital printing makes low minimums (250 to 500) practical for test runs. At 5,000 or more units, flexographic becomes cost-effective. Never over-order on seasonal or event-specific designs.

Should I use a return address label or get envelopes printed?
For any business mailing at consistent volume, custom printed envelopes with your return address pre-printed on the stock are more professional, faster per piece, and eliminate the label application step permanently. Return address labels make sense for low-volume personal correspondence or specialty envelope stocks where direct printing is not compatible.

Can address labels be used on Tyvek envelopes?
Yes. Standard paper labels with permanent adhesive adhere well to Tyvek. Do not run Tyvek envelopes through a laser printer to print addresses directly. The polyethylene material cannot withstand laser fusing temperatures. Print labels on standard label sheets and apply them to the Tyvek face by hand.

What is an envelope seal label?
A circular or custom-shaped adhesive label applied over the sealed flap of an envelope as a decorative closure. Standard sizes are 1.5, 2, and 2.5 inches in diameter. Available in gloss paper, matte paper, clear vinyl, gold foil, and silver foil. Used for wedding invitations, graduation announcements, holiday cards, and any piece where presentation of the sealed back flap is part of the design.

Why use a colored envelope instead of a branded label?
A label on a plain white envelope adds something to the surface. A colored envelope is fundamentally a different piece. The envelope color itself creates visual impact in a mail pile before anyone reads an address, a logo, or any text. For direct mail, fundraising, and event mailings where first impression matters, the envelope color does work that no surface label can replicate.

What file format does a label printer need?
PDF is the standard for most digital and flexographic label printing runs. Provide artwork at 300 DPI at actual print size, in CMYK color mode, with 0.125-inch bleed on all sides. Supply logos in vector format (AI, EPS, or SVG) alongside any raster elements. Confirm exact file requirements with your specific printer before submitting.

Home › Envelope Guides › Envelope Size Chart for Printing

Getting envelope printing right comes down to one practical problem: your print driver needs to know the exact dimensions of the envelope you are loading, and those dimensions differ from the document size the software defaults to. The wrong size setting in Word or Google Docs produces addresses that print in the wrong position every time, wasting envelopes before the real run even starts.

This envelope size chart for printing gives you exact dimensions for every standard US business envelope, correct Word and Google Docs settings, feed orientation, reliable paper weight, and USPS postage class per size. Use it as a reference before every print run. For the complete guide on printer types, troubleshooting, and setup steps, see How to Print on Envelopes: The Complete Guide for Laser, Inkjet, and Bulk Office Printing.

 

Envelope Size Chart for Printing: All Standard US Business Sizes

The table below covers every standard US commercial envelope size used in business printing programs. Dimensions are given in inches. The Word setting column shows the exact size name or custom dimension to enter in the Word Mailings envelope dialog. The postage column reflects 2026 USPS First-Class rates.

Size	Dimensions (inches)	Word Setting	Custom Size (W x H)	Document Fits	Feed Orientation	USPS Class	2026 Postage (1 oz)
#6 3/4	3-5/8 x 6-1/2	Size 6 3/4	6.5 x 3.625	8.5x11 folded in quarters	Short edge first, face up	Letter	$0.82
#9	3-7/8 x 8-7/8	Size 9	8.875 x 3.875	8.5x11 folded in thirds (fits inside #10)	Short edge first, face up	Letter	$0.82
#10	4-1/8 x 9-1/2	Size 10 (4 1/8 x 9 1/2 in)	9.5 x 4.125	8.5x11 tri-folded	Short edge first, face up	Letter	$0.82
#11	4-1/2 x 10-3/8	Custom Size	10.375 x 4.5	Longer documents, multi-page tri-folds	Short edge first, face up	Letter	$0.82
#12	4-3/4 x 11	Custom Size	11 x 4.75	Thick multi-sheet packets	Short edge first, face up	Letter	$0.82
#14	5 x 11-1/2	Custom Size	11.5 x 5	Legal 8.5x14 tri-folded	Short edge first, face up	Letter	$0.82
6 x 9	6 x 9	Custom Size	9 x 6	8.5x11 half-folded, brochures	Short edge first, face up	Letter*	$0.82*
9 x 12	9 x 12	Custom Size	12 x 9	8.5x11 flat, unfolded	Short edge first, face up	Flat	$1.63
10 x 13	10 x 13	Custom Size	13 x 10	Legal 8.5x14 flat, thick packets	Short edge first, face up	Flat	$1.63

* 6x9 qualifies for letter rate on light contents only. Contents over 1 oz or rigid items may shift it to flat rate. Always verify with USPS before bulk mailing. Postage rates per USPS Notice 123, effective July 12, 2026.

For the complete size and capacity breakdown for all formats in this chart, see the business envelope size guide and the full all sizes envelopes collection.

 

How to Set Envelope Size for Printing in Microsoft Word

Word's built-in Mailings tool handles envelope printing for standard commercial sizes. The process is the same across Microsoft 365, Word 2019, and Word 2021.

 

Setting a standard size (#10, #9, #6 3/4) in Word

1. Open Word and click the Mailings tab in the top ribbon.
2. Click Envelopes in the Create group.
3. In the Envelopes and Labels dialog, click Options.
4. Under Envelope Size, select the correct size from the dropdown. For #10, select Size 10 (4 1/8 x 9 1/2 in).
5. Click the Printing Options tab. The diagram shows the correct feed orientation for your printer model.
6. Click OK, type the delivery address, and click Print.

 

Setting a custom size (#11, #12, #14, 6x9, 9x12, 10x13) in Word

1. Follow steps 1 through 3 above.
2. In the Envelope Size dropdown, scroll to the bottom and select Custom Size.
3. Enter the envelope dimensions. Use the long dimension as the Width and the short dimension as the Height. For a 9x12 envelope, enter Width: 12 inches, Height: 9 inches.
4. Click the Printing Options tab and verify the feed orientation matches how you will load the envelope.
5. Always print one test piece on plain paper cut to envelope size before running the full batch.

Tip: Use custom size for any envelope not in the Word dropdown The Word envelope size dropdown includes only the most common commercial sizes. Every size not listed , including #11, #12, #14, 6x9, 9x12, and 10x13 , requires the Custom Size option. Enter the exact dimensions from the chart above. Word treats the long dimension as width and the short dimension as height in landscape orientation.

 

How to Set Envelope Size for Printing in Google Docs

Google Docs does not have a native envelope printing tool. Setting up a custom page size is the most reliable method.

1. Go to File, then Page setup.
2. Set the paper size to Custom.
3. For a #10 envelope: set Width to 9.5 inches and Height to 4.125 inches. Set orientation to Landscape.
4. Set all margins to 0.5 inches.
5. Position the delivery address approximately 2.5 inches from the top and 4 inches from the left using a text box.
6. Before printing, go to File, Print and verify the paper size in the print dialog matches your custom dimensions. Many print drivers override the page settings , always check both.

Envelope Size	Google Docs Width	Google Docs Height	Orientation
#9	8.875 in	3.875 in	Landscape
#10	9.5 in	4.125 in	Landscape
#11	10.375 in	4.5 in	Landscape
#12	11 in	4.75 in	Landscape
#14	11.5 in	5 in	Landscape
6 x 9	9 in	6 in	Landscape
9 x 12	12 in	9 in	Landscape
10 x 13	13 in	10 in	Landscape

 

Paper Weight Guide for Printing on Envelopes

Paper weight is the most common source of envelope printing problems. Envelopes that are too light for the printer feed path cause jams, misfeeds, and smeared toner. The chart below shows which stock weight works for each printer type.

Paper Weight	Inkjet	Laser	High-Volume Laser	Notes
20 lb	Works	Sometimes	Not recommended	Too thin for laser feed paths; curl risk under fuser heat
24 lb	Works	Works	Works	Recommended for most office printing; consistent feed and toner adhesion
28 lb	Works	Works	Best	Premium stock; preferred for high-volume laser and custom-printed programs

All standard white wove envelope formats at Business Envelopes are available in 24 lb stock as standard. 28 lb kraft stock is standard on clasp and catalog formats. See the full range of regular envelopes for stock weight details per format.

 

Address Placement Guide for Each Envelope Size

Once the size is set correctly in Word or Google Docs, the delivery address block must be positioned within the USPS OCR read zone. The position below is measured from the top-left corner of the document in portrait orientation before the envelope is loaded into the printer.

Envelope Size	Return Address Position	Delivery Address: From Top	Delivery Address: From Left
#9	0.25 in from top-left corner	1.5 in	3.5 in
#10	0.25 in from top-left corner	2.0 in	4.0 in
#11	0.25 in from top-left corner	2.0 in	4.5 in
#12	0.25 in from top-left corner	2.0 in	5.0 in
#14	0.25 in from top-left corner	2.2 in	5.0 in
6 x 9	0.5 in from top-left corner	2.5 in	3.0 in
9 x 12	0.5 in from top-left corner	4.0 in	3.5 in

Always test before printing a batch Print one test envelope before running a full batch. Hold the printed test piece over a blank envelope and check that all address elements fall within the correct zones. For window envelopes, insert the document and confirm the address shows through with at least 1/8 inch clearance on all four sides of the window opening.

 

Printing on Window Envelopes: Size and Settings

Window envelopes use the same size settings as plain envelopes of the same format. A #10 window envelope uses the same Size 10 setting in Word as a plain #10. The key difference is in how printing interacts with the window.

• Never print over the window area. The poly-film window is laser-safe but should not receive toner. Position the return address and any logo or custom elements above and to the left of the window zone.
• Do not print the delivery address on a window envelope. The window shows the delivery address from the document inside , printing it on the envelope face creates a duplicate address that confuses USPS OCR equipment.
• Custom-printed window envelopes have the return address and logo pre-printed on the face at the factory. No return address printing step is needed at your printer. See all options at window envelopes and custom printed envelopes.

 

Why Business Envelopes for Envelope Printing Programs

Business Envelopes has supplied envelope stock to US businesses, billing departments, and office printing programs since 1997. Every size in the chart above is stocked in 24 lb white wove as standard, with blank stock shipping same or next business day. Custom-printed envelopes with your logo and return address pre-applied are available across every commercial size with no minimum order and a PDF proof before production.

• No minimums on any order
• Free ground shipping to the contiguous 48 states on every order
• Blank stock ships same or next business day
• Custom-printed orders ship within 7 to 10 business days from proof approval
• All standard commercial formats in stock: #9, #10, #11, #12, #14, 6x9, 9x12, 10x13

See the complete range at all sizes envelopes and the full size reference at Regular Size Envelopes: Every Standard US Format Explained.

 

Business Envelopes carries all these sizes in plain white and colored formats. For invitations where presentation matters before the envelope is even opened, a colored envelope makes the piece immediately visible in a stack of mail.

Postage for graduation announcements: what no one tells you

Most graduation mailing guides say "add a Forever stamp." That is sometimes correct and often not. Here is the complete postage picture.

Standard one-ounce letter: 78 cents (one Forever stamp)

A single 5 x 7 graduation announcement card in an A7 envelope with no inserts typically weighs under one ounce. One Forever stamp covers it. But "typically" is not "always." Thicker cardstock, photo cards with a matte laminate coating, and heavier paper stocks can push a single card over one ounce. Weigh before you stamp.

Two-ounce letter: $1.07 (one Forever stamp plus one additional ounce stamp)

A full graduation suite with an announcement card, a party invitation insert, an RSVP card, and a pre-addressed return envelope routinely weighs over one ounce. Two-ounce postage covers pieces between one and two ounces. Most full suites fall in this range.

Non-machinable surcharge: 49 cents extra

Square envelopes have an aspect ratio of 1:1, which falls below the USPS minimum of 1.3. Square announcement envelopes are automatically classified as non-machinable and charged an extra 49 cents per piece regardless of weight. A square announcement that would otherwise cost 78 cents costs $1.27. On 100 pieces, that is $49 in unexpected surcharges.

Wax seals on envelopes create a raised bump. If that bump makes the envelope non-uniform in thickness, the piece may be classified as non-machinable and charged the surcharge. If you use wax seals, request hand-cancellation at the post office counter so the envelopes are not run through automated sorting equipment. Wax seals that go through sorting machines arrive cracked and destroyed.

The rule that applies to every graduation mailing:

Assemble one complete sample suite, seal it, and take it to a post office counter before buying stamps for the full run. Have a postal employee weigh it and assess any surcharges. Buy your stamps based on that verified weight and classification. This five-minute step eliminates the most common and most expensive graduation mailing mistake: discovering after stamping 150 envelopes that every piece needs 29 cents more postage.

Envelope color for graduation mailings: the case for going beyond white

Most graduation announcement guides show white envelopes. Here is what they do not discuss: colored envelopes dramatically change the first impression the announcement makes before it is opened.

A white envelope in a stack of mail is invisible until someone picks it up. A colored envelope in the same stack gets noticed immediately. For a graduation announcement, this matters because you want recipients to open it promptly rather than setting it aside with the bills and catalogs.

Colored envelopes at Business Envelopes come in two formats:

Wove colored envelopes are solid-color dyed stock with a smooth, professional finish. Available in multiple colors. The color coordinates with the card design without being visually aggressive. Best for formal graduation announcements where the tone is celebratory but still professional.

Starburst envelopes carry a bold multicolor pattern across the face. Designed for maximum visual impact in a pile of mail. The kind of envelope people pick up first and comment on before opening.

Both formats are available in self seal closures at Business Envelopes. For a mailing of 100 or more announcements, self seal saves significant time and produces a more consistent seal than gum flap activation.

How to address graduation announcement envelopes

Addressing etiquette is where most people feel least confident. Here is the complete guide covering every recipient type.

Outer envelope formal addressing format:

Full title and full name. Street address spelled out in full, no abbreviations. City, two-letter state abbreviation, and ZIP code.

Mr. and Mrs. Robert James Holloway
1234 Maple Street
Columbus, Ohio 43201

Married couple, same surname:
Mr. and Mrs. Robert Holloway

Married couple, different surnames:
Ms. Sarah Chen and Mr. Robert Holloway (list alphabetically by last name or by relationship to the graduate)

Unmarried couple, same address:
Ms. Sarah Chen
Mr. Robert Holloway
(each name on its own line)

Single person:
Ms. Jennifer Park

Doctor:
Dr. Marcus Webb (medical or dental) or Dr. Elena Torres (academic doctorate)

Two doctors, married, same surname:
Drs. Marcus and Elena Webb (or The Doctors Webb)

Family with children invited:
The Holloway Family (outer envelope)
If using inner envelope: Mr. and Mrs. Holloway with children's first names listed below

Formal addressing rules most guides mention but few explain clearly:

Spell out "Street," "Avenue," "Boulevard," "Drive," and "Lane" in full on formal outer envelopes. Do not use "St.," "Ave.," "Blvd." The same applies to state names for the most formal occasions: "Ohio" not "OH," "California" not "CA." This level of formality is traditional for college and graduate school announcements. High school and casual party invitations can use standard abbreviations.

Spell out titles: traditionally "Mister" rather than "Mr." in the most formal contexts, though "Mr." and "Mrs." are universally accepted. "Doctor" should be written as "Dr." in all practical cases.

Return address placement: back flap is traditional for formal correspondence. Top-left front corner is also correct and is preferred for pieces where the return address needs to be clearly visible for postal processing. Always include a return address so undeliverable pieces come back rather than disappearing.

The detail every guide misses about addressing graduation envelopes:

The outer envelope goes through the postal system. The inner envelope (if used) is for the recipient's eyes only and carries a more personal, informal address. If you use only one envelope, that envelope must carry the full formal address and must name all invited recipients including children and plus-ones. If you use the traditional two-envelope system, the outer carries the postal address and the inner carries the names of exactly who is invited. The inner envelope is placed unsealed inside the outer envelope.

When to send graduation announcements and invitations

Timing controls whether announcements arrive before recipients have moved on with their schedules and whether invitations give enough lead time for planning and travel.

The flexibility that most guides do not explain:

A pure graduation announcement, one that shares news without requesting attendance at anything, has significant timing flexibility. You can mail it before the ceremony to build anticipation, or you can mail it after the ceremony to include a photo of the graduate in cap and gown. Post-ceremony announcements can go out up to six weeks after the event without any breach of etiquette. Pre-ceremony announcements should arrive at least two weeks before the date.

A graduation party invitation has no such flexibility. It must give guests time to respond, clear their schedules, and arrange travel if needed. Four weeks is the practical minimum. Six weeks is better for any party where some guests will travel from another city.

How many envelopes to order and what to do about mistakes

Order 10 to 15 percent more envelopes than your mailing list count. This is the practical rule that most graduation mailing guides mention and none of them explain the reasoning behind.

Here is why that buffer matters:

Addressing errors. Handwritten addressing mistakes, misspelled names, ink smears, and alignment issues on printed labels will damage some envelopes during the addressing process. On a list of 100, plan for 5 to 10 addressing casualties.

Last-minute additions. You will remember someone after you have already sealed all the envelopes. Your parents will think of a neighbor or former colleague at the last minute. Plan for it.

Keepsakes. Graduate wants one. Parents want one. Grandparents want one. That is at minimum three keepsake envelopes that never get mailed but still need to be accounted for in the order.

Return mail. Some pieces will come back undeliverable. You need spare envelopes to re-send to corrected addresses.

If you run out of envelopes after addressing, you cannot simply order more of the same unless the exact product is available for immediate shipping. At Business Envelopes, blank stock ships same or next business day, and colored envelope stock ships fast. Order the buffer quantity upfront rather than rushing a reorder under pressure.

The complete graduation mailing workflow

Here is the process in the correct order for anyone setting up a graduation mailing from scratch.

Eight to ten weeks before the ceremony or party:
Finalize the guest list and separate into three categories: ceremony guests, party guests, and announcement-only recipients. Collect and verify mailing addresses. Confirm any addresses you are unsure about directly with the recipient. An address that has not been verified in the past year may be outdated.

Seven to eight weeks before:
Order announcement cards, invitation cards, and envelopes. Order 10 to 15 percent more than your list count. If using colored envelopes or self seal options, order those at the same time. Confirm the envelope size matches your card dimensions before placing the order.

Five to six weeks before:
Address envelopes. Work from your spreadsheet or address list. Check every name spelling. For formal announcements, use full titles and spell out street types. For casual invitations, first names and standard abbreviations are appropriate.

Four to six weeks before (invitations):
Assemble invitation suites. Place the invitation card at the bottom, face up. Stack inserts on top in size order, smallest on top. If including a pre-addressed, pre-stamped RSVP return envelope, tuck the RSVP card under the flap of the return envelope. Insert everything into the outer envelope with the text facing the back flap.

Take one fully assembled, sealed sample to a post office counter. Have it weighed. Get the exact postage required. Buy stamps for the full run based on that verified weight.

Two to four weeks before (announcements only) or six to eight weeks before (with event invite included):
Seal and stamp all envelopes. Drop in a blue USPS collection box or deliver to the post office counter. For pieces with wax seals, request hand-cancellation at the counter.

What makes Business Envelopes different for graduation mailings

Business Envelopes has supplied commercial envelopes to US businesses, event planners, and families since 1997. Here is what makes this catalog the right choice for graduation announcement mailings.

Colored envelopes that make your announcement stand out. Wove and starburst colored envelopes in #9, #10, and 6 x 9 formats available with custom printing. For graduation announcements where presentation before opening matters, color signals that the piece inside is worth attention.

Self seal closures that save real time. Self seal envelopes in peel-and-seal and flip-and-stick configurations. On a mailing of 100 or more graduation pieces, self seal eliminates the moisture activation step entirely. No licking, no sponge, no inconsistent sealing. Every envelope sealed the same way, in seconds.

All standard sizes available. All envelope sizes from compact A2 format through larger flat document sizes, in white and colored stock. Every commercial size used in graduation mailings is in the catalog.

Custom printed envelopes with return address. Printed envelopes with the graduate's name and return address pre-printed on the outer envelope stock. Eliminates the return address label step and adds a personal, finished touch to the mailing. PDF proof before production, 7 to 10 business day turnaround.

No minimums, free shipping. Order exactly the quantity your mailing needs, plus the 10 to 15 percent buffer, with no minimum order requirement. Free ground shipping to the contiguous 48 states on every order. Blank stock ships same or next business day.

Frequently asked questions 

What is the difference between a graduation announcement and a graduation invitation?
An announcement shares news of the achievement and does not request attendance. An invitation formally asks someone to attend a ceremony or party and includes event details and RSVP information. Announcements go to a wider circle. Invitations go to a smaller, event-specific list.

What size envelope do I need for a 5 x 7 graduation announcement?
An A7 envelope (5.25 x 7.25 inches). It fits a 5 x 7 inch card with 1/4 inch clearance on the height and 1/8 inch on the width. Mails at First-Class letter rate.

How much postage do graduation announcements need?
A single card in an A7 envelope with no inserts typically costs 78 cents (one Forever stamp) at one ounce. Full suites with inserts, RSVP cards, and return envelopes typically weigh over one ounce and need $1.07 (two-ounce rate). Always weigh a complete sealed sample at the post office before buying stamps for the full run.

When should I mail graduation announcements?
For announcements with no event invitation: 2 to 4 weeks before graduation or up to 6 weeks after. For announcements with a party invitation included: 4 to 6 weeks before the event.

Do square graduation announcement envelopes cost more to mail?
Yes. Square envelopes are classified as non-machinable by USPS and charged a 49-cent surcharge per piece regardless of weight. A square announcement costs $1.27 to mail instead of 78 cents.

Do I need to use an inner and outer envelope for graduation announcements?
No. Inner envelopes are traditional for the most formal occasions but are entirely optional. If you use only one envelope, include all invited recipient names on the outer envelope and use it to communicate exactly who is invited.

How many extra envelopes should I order?
Order 10 to 15 percent more than your mailing list count. This covers addressing errors, last-minute additions, keepsake copies, and any pieces that are returned undeliverable and need to be re-sent.

Can I use wax seals on graduation announcement envelopes?
Yes, but request hand-cancellation at the post office counter. Wax seals run through automated postal sorting equipment arrive cracked or destroyed. Hand-cancellation is free and ensures the envelope goes through the system without machine damage to the seal.

Home › Envelope Guides › Envelope Window Material Guide

Most people who use window envelopes every day have never thought about what the window is actually made of. It looks like glass. It feels slightly stiff. It lets the address show through. That is all most programs need to know.

Until the laser printer fuses a cheap window flat. Until the recycling program rejects an envelope. Until procurement asks whether the organization's envelopes meet its sustainability commitments. Then the envelope window material matters quite a lot.

This guide explains the two main envelope window materials, how each performs in a laser printer, what USPS requires from window film, and which material to order based on how the program actually operates. For the full window envelope buying guide including sizes, formats, and closure types, see Business Envelopes With Window: Complete Buyer's Guide.

 

What Is the Window in an Envelope Made Of?

The transparent panel on the face of a window envelope is a thin film patch bonded to the inside of a die-cut opening in the envelope body. The film is held in place by a hot-melt adhesive applied along the edges of the opening during manufacturing. The film must be optically clear enough for postal equipment to read the address through it. It also must be thin enough to lie flat without causing inserter jams, and stable enough to survive laser fuser heat without warping.

Two materials are in common use for this film in the US commercial envelope market:

• Polypropylene (PP): A petroleum-based clear plastic film. The standard material in commercial business envelopes for billing, invoicing, and statement programs.
• Glassine: A semi-transparent paper-based material made from cellulose fiber. The preferred option for organizations with sustainability or paper-recyclability requirements.

 

Polypropylene Window Film: The Commercial Standard

Polypropylene (PP) is the envelope window material used in the vast majority of commercial business envelopes sold in the United States. It is a thin, flexible, clear plastic film formulated specifically for envelope manufacturing. The commercial envelope version differs from general-purpose polypropylene in that it is engineered for the specific requirements of envelope inserting equipment, USPS postal sorting, and laser printer compatibility.

 

Properties of polypropylene window film

• Optical clarity: High. Polypropylene produces a sharp, clear window. The address on the enclosed document reads through without distortion, glare reduction, or haze that could interfere with USPS OCR scanning.
• Laser printer compatibility: Laser-safe grades of polypropylene window film are formulated to withstand fuser temperatures up to 230 degrees C without softening, warping, or releasing material that could contaminate the fuser roller. Standard commercial window envelopes from established suppliers use laser-safe PP film.
• Inserter machine performance: Polypropylene film is calibrated for the friction coefficients that inserter equipment requires. It feeds without sticking to machine components and maintains dimensional stability through mechanical folding and insertion.
• Recyclability: The paper body of a polypropylene window envelope is recyclable in standard paper recycling. The PP film patch must be separated from the paper body before paper recycling in most curbside programs. The PP film may be accepted at plastic film drop-off locations, but this varies by municipality.

★★★★★

"No transparency, adhesion works great and price is great!"

Joe Morgan | Verified buyer, #10 Window Business Envelopes Peel and Seal Security Tinted

Source: businessenvelopes.com product reviews

 

Glassine Window Film: The Recyclable Alternative

Glassine is a semi-transparent paper-based film made from cellulose fiber. It is produced by processing cellulose pulp to a high degree of refinement that produces a smooth, dense, slightly translucent sheet. Because glassine is paper-derived, it is compatible with standard paper recycling streams. An envelope with a glassine window can be recycled as a complete unit in most paper recycling programs without removing the window material first.

 

Properties of glassine window film

• Optical clarity: Moderate. Glassine windows appear slightly more matte and less optically sharp than polypropylene. The address remains readable through the window, but the clarity difference is visible when the two materials are compared side by side.
• Laser printer compatibility: Glassine is paper-based and generally more heat-tolerant than plastic films. However, always confirm laser compatibility with the supplier for the specific product before running through a laser printer.
• Recyclability: The primary advantage. Glassine is cellulose-based and compatible with paper pulping processes. The envelope body and window film can be recycled together in standard paper recycling. For organizations with sustainability targets, ESG commitments, or procurement policies requiring recyclable packaging, glassine windows allow the entire envelope to be disposed of in the paper recycling stream.
• Appearance: Slightly matte and less optically sharp than polypropylene. Some postal programs note that the reduced glare from glassine can be an advantage for USPS optical character recognition scanning in certain lighting conditions, though both materials meet USPS readability standards when properly manufactured.

 

Polypropylene vs Glassine: Side-by-Side Comparison

Property	Polypropylene (PP)	Glassine
Optical clarity	High , sharp, clear window	Moderate , semi-transparent, matte finish
Laser printer safe	Yes , laser-safe grades withstand 230°C fuser	Generally yes , paper-based; confirm per product
Inserter machine performance	Excellent , calibrated for commercial inserters	Good , less widely tested across all inserter types
Paper recyclability	Film must be removed first in most programs	Recyclable with envelope body in standard paper recycling
Availability	Standard , all commercial window envelopes	Specialty , available from select suppliers on request
Best for	Standard billing, invoicing, check programs	Sustainability programs, ESG requirements

 

USPS Requirements for Envelope Window Film

USPS automated sorting equipment reads the delivery address through the envelope window using optical character recognition (OCR). For postal processing to work correctly, the envelope window material must meet several requirements:

• Clarity: The film must be sufficiently transparent for OCR equipment to read the address. Excessive haze, distortion, or glare that prevents barcode scanning causes the piece to be pulled from automation and processed manually, which increases postage cost.
• Window position: The window must be positioned at least 1/2 inch from the left edge and at least 5/8 inch from the bottom edge of the envelope to place the address within the USPS delivery address clear zone.
• Flat and uniform surface: The window film must lie flat without bubbling, warping, or creating an uneven surface that interferes with automated sorting equipment.
• No dark patterns near the window: The area immediately around the window must not have dark ink or pattern that could interfere with address reading.

Standard commercial window envelopes from established suppliers are manufactured to meet these requirements. The window material, position, and construction are specced to USPS standards. See all window envelope formats at window envelopes.

 

Envelope Window Material and Laser Printer Safety

Laser printer safety is the most operationally critical property of the envelope window material for organizations that print directly onto envelopes or run envelopes through laser printers for address or data printing.

A laser printer uses a fuser unit to bond toner to paper by applying heat and pressure. Fuser temperatures typically run between 180 and 230 degrees C. Every envelope that passes through a laser printer travels through that fuser. Window film that is not rated laser-safe softens or warps at fuser temperatures. A warped or partially melted window film contaminates the fuser roller, damages the fuser unit, and voids most printer warranties.

Important: Not all polypropylene window films are laser-safe. The commercial-grade PP film used in standard business envelopes from established suppliers is formulated specifically for laser compatibility. Generic or retail-packaged window envelopes may use standard PP film not rated for laser fuser temperatures. Always confirm laser-safe specification before running any window envelope through a laser printer.

All window envelope formats at Business Envelopes use poly-film that will not wrinkle or distort under laser printer heat. The paper stock also handles laser printing without tearing or curling under fuser pressure.

★★★★★

"These envelopes are a great choice, the price and quality and peel-seal make them my favorites to purchase."

Barbra Chin | Verified buyer, #10 Window Business Envelopes Peel and Seal Security Tinted

Source: businessenvelopes.com product reviews

 

Does Security Tinting Affect the Window Film?

No. Security tinting and the window film are entirely separate elements of the envelope. Security tinting is an interior pattern printed on the paper body of the envelope. It blocks the document contents from showing through the paper when held to light. The window film itself remains fully clear and unaffected by the tinting pattern.

The two work independently: the tinting protects the document contents from view through the paper body, while the window film continues to display the recipient's address normally through the clear window opening. For billing, financial, healthcare, and legal correspondence, security-tinted window envelopes combine both functions in one format. For the complete guide to security tinting, see Security Tinted Envelopes: What They Are and When to Use.

 

How to Choose the Right Envelope Window Material

Three questions determine which window material to order:

1. Will the envelopes go through a laser printer? If yes, confirm the envelope is rated laser-safe regardless of whether the film is polypropylene or glassine. Polypropylene is the more reliable choice for laser-printing programs because its laser-safe formulation is the established standard.
2. Does the organization have sustainability or recycling commitments? If recycling the complete envelope in standard paper recycling is a requirement, glassine film is the correct choice. Check with your supplier on availability before committing to glassine for a high-volume program.
3. Does the program use an inserter machine? If yes, confirm inserter compatibility before ordering glassine, since glassine has less published inserter testing data than polypropylene. Most high-volume automated programs use polypropylene as the default.

For standard commercial billing, invoicing, statement, and check programs, polypropylene window film is the correct choice. It is laser-safe, inserter-tested, USPS-compliant, and widely available. For the full window envelope range, see window envelopes and the complete format guide at the Business Envelopes With Window: Complete Buyer's Guide.

 

Why Business Envelopes for Window Envelope Orders

Business Envelopes has supplied window envelopes to billing departments, healthcare offices, accounting firms, and direct mail operations across the United States since 1997. Every window envelope in the catalog uses poly-film that will not wrinkle or distort under laser printer heat. Window positions are manufactured to USPS standards and align with the standard address output of QuickBooks, Sage, and all major US billing platforms. Custom printing is available on all formats via custom printed envelopes.

• No minimums on any order
• Free ground shipping to the contiguous 48 states on every order
• Blank stock ships same or next business day
• All window formats laser-safe as standard
• Single window, double window, security tinted, gum flap, peel-and-seal, and flip-and-stick formats stocked

 

The piece must be rectangular and flexible. It must have an aspect ratio (length divided by height) between 1.3 and 2.5. A standard #10 envelope at 4.125 x 9.5 inches has an aspect ratio of 2.3, which sits comfortably within the required range.

What triggers the 49-cent non-machinable surcharge:

Square envelopes, because their aspect ratio is 1:1. Envelopes with exterior clasps, strings, or buttons. Envelopes containing rigid objects. Envelopes with non-uniform thickness (lumpy contents). Pieces with the delivery address parallel to the shorter dimension. Envelopes over 6 inches long or 4.25 inches tall that are less than 0.009 inches thick.

What moves a letter to flat-rate postage ($1.63 minimum):

Any piece over 6.125 inches tall, over 11.5 inches long, or over 0.25 inches thick. Documents that cannot be folded into a standard letter envelope need to be mailed as flats in a 9 x 12 catalog envelope or larger. Flat-rate postage is higher, but for documents that must arrive unfolded, a flat envelope is the correct choice.

Addressing your mail correctly: the USPS standard

Correct addressing is the single most effective thing you can do to prevent returned mail. USPS optical character recognition equipment reads the delivery address and routes the piece automatically. Address formatting that the machine cannot parse goes to manual sorting, which slows delivery and increases error risk.

The complete address format USPS recommends:

RECIPIENT NAME OR COMPANY NAME
ATTENTION LINE (if applicable)
STREET ADDRESS AND SECONDARY UNIT ON SAME LINE
CITY STATE ZIPCODE

Example:
JAMES HOLLOWAY
ACME ACCOUNTING LLC
1234 MAIN ST STE 400
CHICAGO IL 60601-1234

Key formatting rules from USPS Publication 28:

Use all capitals for best machine readability. Use no punctuation. Left-justify every line in the address block. Use the two-letter state abbreviation, one space between city and state, two spaces between state and ZIP code. Use ZIP+4 when available for best routing accuracy. Use a minimum of 8-point type for printed addresses. Sans serif fonts (Arial, Helvetica) read more cleanly through OCR equipment than serif fonts on machine-sorted mail.

Return address placement:

Upper-left corner of the envelope face. At least 0.5 inches from the left edge and 0.5 inches from the top edge. Must not extend into the OCR read area (the zone running from 0.5 inches up from the bottom edge across the face). A return address is required on most mail classes. Without one, undeliverable mail goes to the USPS Mail Recovery Center in Atlanta rather than back to you.

For window envelopes:

The delivery address printed on your document must show completely through the window with at least 1/8 inch clearance on all four sides. USPS requires a clear zone around the address visible through any window. If the address shifts when the document is inserted, or if any edge of the address block is cut off by the window frame, the piece fails postal standards and may be returned or assessed additional postage.

Choosing the right envelope for every type of business mailing

The envelope you choose affects postage cost, delivery success, and recipient impression. Here is the complete matched guide.

Standard business letters, notices, and correspondence:
#10 envelope (4.125 x 9.5 inches). Holds an 8.5 x 11 sheet folded in thirds. The US standard for all commercial correspondence. Mails at First-Class letter rate with one Forever stamp for standard one-ounce weight. Available in plain white, security tinted, window, double window, self seal, and peel and seal closures.

Invoices, statements, and billing correspondence:
Window envelope in #10 format. The recipient address on your printed document shows through the window. No labels, no separate addressing step, no error risk from mismatched addresses. Compatible with QuickBooks, Xero, FreshBooks, Sage, and all major billing software. For payroll and check mailing, double window check envelopes align with both the payee and return address fields on standard check formats.

Financial documents, payroll, and sensitive correspondence:
Check envelopes with security tinting. The interior pattern blocks document contents from being visible when the envelope is held to light. Standard practice for any mailing carrying account numbers, check amounts, or personal financial data.

Contracts, legal documents, and flat correspondence:
9 x 12 catalog envelope for documents that must arrive unfolded. Mails as a USPS flat at $1.63 for one ounce. For documents where arrival condition is non-negotiable, Tyvek envelopes in 9 x 12, 10 x 13, and 10 x 15 sizes resist tearing, puncture, and moisture from the material structure of the envelope itself.

Reply and return enclosures:
#9 envelope (3.875 x 8.875 inches) nests inside a #10 with 0.25 inches of clearance. Pre-addressed and pre-stamped return envelopes inside billing or appeal mailings significantly improve response rates. Pre-stamping the return envelope removes the barrier of the recipient needing to find a stamp.

High-volume direct mail and campaigns:
Colored envelopes in wove solid-color or starburst formats. According to Lob's 2025 State of Direct Mail research, 81 percent of consumers are more likely to re-engage with a brand after receiving direct mail, and 56 percent remember brands better from mail than from digital alone. The outer envelope is the first impression. A colored or patterned envelope stands out in a mail pile before the recipient has processed what it contains. Printed envelopes with a logo and return address increase recognition and open rates.

High-volume letter operations:
Self seal envelopes in peel-and-seal or flip-and-stick configurations. No moisture activation. Consistent seal on every piece. For a billing department sealing 400 envelopes per month, self seal saves 30 to 45 minutes per mailing run compared to gum flap activation and eliminates inconsistent sealing that can result in pieces coming unsealed in transit.

First-Class Mail vs Certified Mail: when each is the right choice

This decision matters more than most businesses realize. Choosing the wrong service can either waste money on unnecessary documentation or leave you without legal proof when you need it.

Use First-Class Mail when:

You are sending routine business correspondence, invoices, statements, notices, promotional letters, and any communication where proof of delivery is not a legal or contractual requirement. First-Class is fast (typically 1 to 5 business days), includes forwarding and return service, and costs only 78 cents for a standard one-ounce letter. For the vast majority of business mail, this is the right service.

Use Certified Mail when:

You need documented proof that a specific piece of mail was sent on a specific date and received by a specific person. Certified Mail provides a mailing receipt at the time of sending and delivery confirmation with date and time. Add Return Receipt (electronic or printed postcard) to get the recipient's signature. The current Certified Mail fee is $5.30 in addition to standard First-Class postage.

Situations where Certified Mail is the correct choice: legal notices and demand letters where "I never received it" could be used as a defense. Eviction notices, termination letters, or employment actions where proof of notice is legally required. Contract terminations or amendments requiring acknowledgment. IRS correspondence and tax-related notices. Any situation where a dispute over receipt could result in legal or financial consequences that exceed the cost of the Certified Mail fee.

Use Registered Mail when:

Maximum security is required. Registered Mail is handled separately from regular mail, signed for at every stage of its journey, and provides chain-of-custody documentation. Used for high-value items, classified documents, and correspondence where tampering would be detectable. More expensive and slower than Certified Mail. Appropriate for very high-stakes correspondence such as legal filings, court documents, and sensitive financial instruments.

The detail most guides miss about Certified Mail:

Standard First-Class Mail does not provide tracking for letters. If you need to confirm that a letter arrived, your only options are Certified Mail (which provides delivery confirmation and signature) or paying to upgrade to Priority Mail (which includes tracking). Checking USPS Tracking on a standard First-Class letter does not show delivery status for most letter-class pieces. If delivery confirmation matters to you for a specific piece, decide at the time of mailing, not after.

The most common business mailing mistakes and how to avoid every one

Insufficient postage on heavy letters. A standard letter weighing over one ounce needs additional postage at 29 cents per ounce over the first. Two sheets of 24 lb bond paper plus a quality #10 envelope comes in just under one ounce. Add a return reply envelope inside and the piece is almost certainly over one ounce. Weigh every piece that has unusual contents before sealing and stamping. An insufficiently stamped letter is returned to sender with no indication of why until you open it.

Wrong envelope triggering a non-machinable surcharge. Square envelopes, envelopes with exterior clasps, envelopes with rigid or lumpy contents. These all cost an extra 49 cents per piece. On 100 pieces per month, that is $588 per year in unnecessary surcharges. The solution is using a standard #10 envelope with properly folded contents for all standard correspondence.

Address formatting errors causing misdelivery. Missing suite or apartment numbers, incorrect ZIP codes, misspelled street names, and outdated addresses after a recipient has moved. USPS recommends running address lists through NCOA (National Change of Address) within 95 days before any large mailing. For smaller volume, verify addresses using the USPS ZIP Code Lookup tool before mailing to unfamiliar addresses. Always include a return address so undeliverable pieces come back rather than disappearing.

Using Marketing Mail when First-Class is required. Marketing Mail (bulk mail) is not forwarded when recipients move and is not returned unless you pay for ancillary service endorsements. If a customer changes address and you send their invoice via Marketing Mail without address management, the invoice disappears and your payment is delayed. For billing, invoices, and any piece that must reach a specific person, First-Class Mail is required.

Window envelope address misalignment. A window envelope where the address block on the enclosed document does not align correctly with the window can cause the piece to be returned, addressed incorrectly, or assessed additional postage for non-compliance. Test window alignment before running any large batch. Fold a printed document, insert it, and hold the sealed envelope up to light. The complete address must show through the window with at least 1/8 inch clearance on all four sides.

Not using certified mail when the law requires it. Some legal notices, regulatory filings, and employment actions require documented proof of delivery. Sending a legal notice by standard First-Class Mail and hoping the recipient cannot later claim they never received it is a risk that Certified Mail eliminates for $5.30 per piece. The cost of a failed eviction notice or an undocumented termination letter is many times the cost of the Certified Mail fee.

Storing label-addressed envelopes in warm conditions before mailing. Labels can partially release when stored in warm or humid environments between application and mailing. If your office pre-addresses envelopes days before they go out, use window envelopes to eliminate label adhesion risk entirely, or print directly on the envelope face rather than applying labels.

How to save money on business mailing at volume

This is the section that matters most for any business spending more than a few hundred dollars per month on postage.

Switch to metered or online postage for letter volume over 50 pieces per week. Retail stamp rate for a First-Class letter is 78 cents. Metered postage through platforms like Stamps.com, Pitney Bowes PitneyShip, or USPS Click-N-Ship is 74 cents per letter. On 50 letters per week, that is $2 per week or $104 per year. On 500 letters per week, it is $20 per week or $1,040 per year. The platform fee (typically $20 to $40 per month) pays for itself quickly at these volumes.

Use window envelopes to eliminate addressing labor. A billing department that addresses 200 invoices per month by printing labels, applying them, and checking placement spends roughly 20 to 30 minutes per billing run on that step alone. Window envelopes eliminate that step entirely. The address on the printed invoice shows through the window. No labels, no application, no verification step. At 12 billing runs per year, that is 4 to 6 hours of staff time recovered annually.

Presort for mailings over 500 pieces of First-Class Mail. Presorted First-Class Mail (sorted by ZIP code before delivery to USPS) qualifies for automation discounts. At 500 pieces minimum, the base presort discount reduces the per-piece rate. For businesses mailing 5,000 or more letters per cycle, working with a presort mail service provider can save 15 to 40 percent on postage by comminglaing your mail with other mailers to achieve deeper sort levels.

Consider Marketing Mail for promotional and non-urgent correspondence over 200 pieces. Marketing Mail automation rates start as low as 24 cents per piece at carrier route presort levels. For newsletters, promotional offers, and correspondence that does not need to reach a specific individual (where forwarding and return are not critical), Marketing Mail can reduce postage cost by more than 60 percent versus First-Class. The tradeoffs: 3 to 10 day delivery window, no automatic forwarding, minimum 200 piece requirement, and need for a USPS bulk mail permit ($245 annually).

Use self seal envelopes to reduce sealing labor. On a run of 500 letters, gum flap sealing requires moisture application on 500 flaps. At an optimistic 10 envelopes per minute, that is 50 minutes of sealing labor plus the time to verify each flap sealed correctly. Self seal envelopes process in seconds per piece. No moisture, no verification. The cost premium over gum flap is typically offset by the labor saving on the first mailing run.

How to mail a letter: the complete step-by-step process

For anyone setting up a new mailing workflow or reviewing an existing one, here is the complete process from document to mail drop.

Step 1: Choose the correct envelope. Match the envelope to the content. Standard letter in a #10 envelope. Invoice in a window envelope. Flat document in a 9 x 12 catalog envelope. Sensitive financial document in a check envelope with security tinting. Document that cannot be damaged in a Tyvek envelope.

Step 2: Fold and insert the document correctly. For a standard 8.5 x 11 letter in a #10 envelope: fold the bottom third up, fold the top third down over it. Insert with the top of the letter facing up and toward the envelope flap so the recipient sees the top of the page when they open it. For window envelopes, verify that the address block shows completely through the window before sealing.

Step 3: Seal the envelope. For gum flap envelopes, moisten and press firmly across the entire flap length. For self seal envelopes, peel the liner strip and press the flap firmly. For clasp envelopes, seal the gum flap first, then fold the metal clasp down over it.

Step 4: Address the envelope. For non-window envelopes: return address in the upper-left corner, delivery address centered on the face. Follow USPS formatting standards. For window envelopes: verify the address shows through correctly after insertion and sealing.

Step 5: Calculate and apply postage. Weigh the sealed envelope if there is any uncertainty about the one-ounce threshold. Apply stamps to the upper-right corner. For standard one-ounce letters, one Forever stamp (78 cents). For heavier pieces, use additional ounce stamps or a postage scale with metered postage.

Step 6: Send. Drop in a blue USPS collection box, place in your home or office mailbox with the flag raised, hand to a letter carrier, or take to a post office counter. Pieces weighing over 10 ounces with only stamps as postage must be taken to a post office counter, not dropped in a collection box. If requesting Certified Mail, hand-cancellation, or any special service, take to the post office counter.

What makes Business Envelopes different for business mailing

Business Envelopes has supplied commercial envelopes directly to US offices, law firms, healthcare facilities, nonprofits, and direct mail operations since 1997. Here is what separates this catalog for organizations running any volume of outgoing mail.

Every format for every use case in one catalog. #10 envelopes plain, tinted, window, double window, self seal, colored. Catalog envelopes in 6 x 9, 9 x 12, 10 x 13, and 10 x 15. Tyvek envelopes for documents that cannot arrive damaged. Check envelopes with security tinting. Colored envelopes for direct mail. Printed envelopes with logo and return address. Everything from one supplier, one order, one shipment.

Self seal in every major commercial size. No moisture activation. Consistent seal. Available in #6 3/4, #9, #10, 6 x 9, 9 x 12, 10 x 13, and 10 x 15. Peel-and-seal and flip-and-stick closures. For high-volume mailing operations, self seal makes a meaningful difference in labor time and consistency per run.

Custom printed envelopes that carry your brand. Logo, return address, and tagline printed directly on the envelope stock. PDF proof before production, nothing goes to press without your approval. Artwork on file for reorders. 7 to 10 business day turnaround from proof approval. Custom printing available across every size and style in the catalog.

Free ground shipping, no minimums. One box or a pallet, shipping is free to the contiguous 48 states. Blank stock ships same or next business day. No minimum order on any product.

The bottom line on mailing and sending letters

Use First-Class Mail for everything that needs to reach a specific person on a reliable timeline. Use Certified Mail when you need documented proof of delivery for legal or compliance reasons. Use a #10 envelope for standard correspondence and window envelopes for recurring billing. Weigh before you stamp anything that has unusual contents. Keep a return address on every piece so undeliverable mail comes back to you. And for any mailing volume over 50 pieces per week, calculate whether metered postage, self seal envelopes, and window formats together could meaningfully reduce your weekly mailing cost.

Frequently asked questions 

How much does it cost to mail a letter in 2025?
A standard First-Class letter weighing one ounce costs 78 cents as of July 2025. Each additional ounce costs 29 cents. Square or non-machinable envelopes cost a 49-cent surcharge on top of standard postage. Large envelopes or flats start at $1.63 for one ounce.

How do I know if my letter weighs more than one ounce?
Weigh it on a postal scale or kitchen scale before stamping. As a practical rule of thumb, four sheets of standard 20 lb printer paper plus a standard #10 envelope equals approximately one ounce. Add a return reply envelope inside or use heavier paper stock and you are likely over one ounce.

What is the difference between First-Class Mail and Certified Mail?
First-Class Mail is the standard service for everyday correspondence with 1 to 5 day delivery and no tracking for letters. Certified Mail adds documented proof of mailing and delivery confirmation with signature, for an additional $5.30 fee. Use Certified Mail when you need legal or documented proof that a specific person received a specific piece of mail.

What envelope should I use for monthly invoices?
A window envelope in #10 format. The recipient address printed on your invoice shows through the window. No labels, no separate envelope printing step, compatible with all major accounting software. Add security tinting for invoices carrying account numbers or sensitive financial data.

Can I put outgoing mail in my home mailbox?
Yes. Place stamped, sealed mail in your mailbox and raise the red flag. Your letter carrier will pick it up on their next delivery. Note: carriers are not required to check mailboxes without deliveries scheduled that day. For time-sensitive pieces, drop directly in a blue collection box or take to a post office counter.

When does mail need to go to the post office counter instead of a collection box?
Any piece weighing over 10 ounces with only stamps as postage must go to the post office counter. Pieces requiring Certified Mail, Registered Mail, Return Receipt, or other special services must also be presented at the counter. Pieces you want hand-cancelled (to protect wax seals or get a postmark for the day) must go to the counter.

What is the fastest way to get a letter delivered?
Priority Mail Express guarantees overnight to 2-day delivery with a money-back guarantee to most US addresses. Priority Mail provides 1 to 3 day delivery with tracking and up to $100 insurance. For standard First-Class Mail, there is no guaranteed delivery window, though typical delivery is 1 to 5 business days.

How do I mail a document that cannot be folded?
Use a 9 x 12 catalog envelope to hold an 8.5 x 11 sheet completely flat. For Legal-size documents, use a 10 x 13. For documents that genuinely cannot arrive with any damage, use a Tyvek envelope. These pieces mail as flats at a higher postage rate starting at $1.63 for one ounce.

What should I do when a letter comes back undeliverable?
Read the USPS reason code stamped on the piece. Common codes: "Attempted Not Known" means the recipient name was not recognized at that address. "Moved Left No Address" means the recipient moved without leaving a forwarding address. "Insufficient Postage" means the piece did not have enough stamps. Verify the address with the recipient before resending. For business mailing lists, run the list through NCOA (National Change of Address) to update addresses before your next mailing cycle.

Home › Envelope Guides › Double Window Envelope Template Word

 

A double window envelope eliminates the addressing step entirely. Both the recipient's delivery address and your return address show through the two transparent windows directly from the document inside. No labels. No printing on the envelope face. Nothing added by hand. The document does all the work.

The challenge is setting up your Word document so both addresses land in exactly the right positions to show through both windows after folding. This guide covers how to do that, the difference between check-format and invoice-format double window templates, the correct fold direction, and how to test alignment before committing to a full print run. For setup instructions covering other envelope types and printer configurations, see the Complete Guide for Laser, Inkjet, and Bulk Office Printing.

 

Understanding the Double Window Envelope

A double window envelope has two transparent poly-film panels on the face: one in the lower-left area for the recipient's delivery address, and one in the upper area for the sender's return address. Both addresses pull from the document inside. Nothing is printed or addressed on the envelope itself.

Two distinct double window formats exist, and they use different window positions. Understanding which format you are using is the first step before setting up any Word template.

Format	Designed For	Outer Dimensions	Window Positions
Check format (security tinted)	QuickBooks, Sage, Peachtree voucher checks	Check-size format	Calibrated to where accounting software prints payer and payee addresses on a check form
Invoice/statement format (#10)	Billing statements, invoices, general correspondence	4-1/8 x 9-1/2 inches (#10)	Standard window positions matched to billing software invoice templates

The two formats are not interchangeable. Using a check-format envelope for an invoice document, or an invoice-format envelope for a check, produces misaligned addresses every time. Confirm your format before setting up your Word template. See all formats at double window envelopes.

 

How to Set Up a Double Window Envelope Template in Word (Invoice/Statement Format)

The following steps apply to the standard double window #10 invoice envelope format. For the check-format double window, see the dedicated check section below.

 

Step 1: Set your document page size

In Word: Layout tab › Size › More Paper Sizes

Set the page width to 9.5 inches and the page height to 4.125 inches. This matches the #10 envelope dimensions (4-1/8 x 9-1/2 inches). Set the orientation to Landscape. Set all margins to 0.5 inches.

If you are building the template as a letter-size document that will be tri-folded into the envelope (which is more common for invoices and statements), skip this step and use your standard 8.5 x 11 document. The address positions below are for the tri-folded 8.5 x 11 document approach, which is how most billing software and Word invoice templates work.

 

Step 2: Understand the fold and window relationship

For a double window #10 invoice envelope, the standard fold is a Z-fold (accordion fold):

1. Hold the 8.5 x 11 document face-up with the top of the page at the top.
2. Fold the bottom third of the document up toward the top. The fold line sits at approximately 3.67 inches from the bottom.
3. Fold the top third back down in the opposite direction. The fold line sits at approximately 7.33 inches from the bottom.
4. The result is a tri-folded panel approximately 3.67 x 8.5 inches.
5. Insert the folded document into the envelope face-forward with the delivery address facing the window side.

After this fold, the delivery address on your document needs to land in the lower-left area of the outer face, visible through the lower window. The return address needs to land in the upper area of the outer face, visible through the upper window.

 

Step 3: Position the delivery address block

Delivery address position on the 8.5 x 11 document:

The delivery address block should sit approximately 2.25 to 2.5 inches from the top of the document and 3.75 to 4 inches from the left edge. After the Z-fold, this places the address in the lower-left area of the outer panel, centered in the delivery address window.

In Word, the easiest way to position the delivery address precisely is to use a text box:

1. Go to the Insert tab and click Text Box, then Draw Text Box.
2. Draw the text box on your document at the correct position.
3. Right-click the text box, select Format Text Box, and set the exact position: horizontal 4 inches from the left margin, vertical 2.4 inches from the top margin.
4. Set the text box width to 3.5 inches and height to 1 inch to match the window opening.
5. Remove the text box border (set line to No Line) so it does not print.
6. Type or insert your delivery address field in the text box.

 

Step 4: Position the return address block

Return address position on the 8.5 x 11 document:

The return address block should sit approximately 0.5 inches from the top of the document and 0.5 inches from the left edge. After the Z-fold, this positions the return address in the upper-left area of the outer back panel, visible through the upper window.

Use the same text box method as the delivery address. Set the horizontal position to 0.5 inches from the left margin and the vertical position to 0.5 inches from the top. Set the width to 3.5 inches and height to 0.75 inches. This is your fixed return address , it does not change per recipient.

Important: The exact position offsets vary slightly between different double window envelope products. Always verify the window position specifications for your specific envelope before finalizing the template. The positions above apply to the standard double window #10 invoice format. They will not match a check-format double window envelope.

 

Step 5: Save as a Word template

Once the address positions are set and tested:

1. Go to File › Save As.
2. In the file type dropdown, select Word Template (.dotx).
3. Name the file something clear: "Double Window Envelope Invoice Template."
4. Save to your templates folder.

Every time you need to produce a new invoice or statement run, open the template, update the delivery address field (or connect to your mail merge list), and print. The return address stays fixed in position across every use.

 

How to Set Up a Double Window Check Envelope Template in Word

The check-format double window envelope uses different window positions than the invoice format. The windows are calibrated to where QuickBooks, Sage, Peachtree, and compatible accounting software print the payer and payee addresses on a standard voucher check form.

For QuickBooks Desktop users, the standard voucher check template already places both addresses in positions that align with the check-format double window envelope. The check form IS the template , you are not creating a separate Word document for the address positions. The check prints from within QuickBooks with both addresses in the correct location, and the envelope receives the folded check.

For users printing checks through Word or a third-party service, the address positions must match the window specifications of the specific check-format double window envelope. Check-format envelopes have a lower bottom window (approximately 3/4 inch from the bottom edge) positioned to show the payee address while keeping check amounts, routing numbers, and account numbers hidden behind the opaque envelope body.

QuickBooks Online note: QuickBooks Online handles check printing differently from QuickBooks Desktop. If you are using QBO with a connected print service, confirm the check template your service uses places both addresses in the standard window positions before ordering check-format envelopes in bulk. Test one piece before any batch run.

See the check-format double window envelope at Double Window Security Check Envelopes Flip and Stick Designed for QuickBooks Quicken Sage.

★★★★★

"Durable, secure, and easy to use , these Flip and Stick double window envelopes are perfect for mailing checks efficiently."

Justin T | Verified buyer, Double Window Security Check Envelopes Flip and Stick Designed for QuickBooks Quicken Sage

Source: businessenvelopes.com product reviews

 

Using Mail Merge with a Double Window Envelope Template in Word

Word's mail merge feature works with double window envelope templates when you are printing variable delivery addresses for multiple recipients on a single invoice or statement run.

 

Mail merge setup for double window invoice envelopes

1. Open your double window envelope template in Word.
2. Go to the Mailings tab and click Start Mail Merge, then select Normal Word Document (not the Envelopes option, which is for printing on the envelope itself rather than a document that folds into an envelope).
3. Click Select Recipients and connect to your Excel spreadsheet or contact list containing the delivery addresses.
4. Place your cursor inside the delivery address text box and click Insert Merge Field to insert address fields: name, street, city, state, zip.
5. Keep the return address text box fixed with your organization's address typed directly , do not use a merge field for the return address unless it varies per recipient.
6. Click Preview Results to confirm address positioning looks correct across multiple records.
7. Print one test piece before running the full merge.

 

Testing Alignment Before Every Batch Run

This step is not optional. Even a correct template can produce misaligned addresses if the printer margin settings shift, the paper stock changes, or the template is modified between runs.

1. Print one test document from your Word template.
2. Z-fold the document using the same fold method you will use in the actual run.
3. Insert the folded document into the double window envelope with the address side facing outward toward the windows.
4. Hold the envelope up to a light source. Both addresses should appear fully inside their windows with at least 1/8 inch of clearance on all four edges.
5. Check for exposed data. No content other than the addresses should be visible through the envelope body or the window edges.
6. If either address is shifted, adjust the text box position in your Word template by increments of 0.1 inches and test again.

★★★★★

"Great fit. Strong seal. No fuss."

Emily Davis | Verified buyer, Double Window Security Check Envelopes Flip and Stick Designed for QuickBooks Quicken Sage

Source: businessenvelopes.com product reviews

 

Choosing the Right Double Window Envelope to Match Your Template

The Word template setup depends entirely on which double window envelope format you order. Confirm the format before building the template. Two distinct formats and three closure types are available at Business Envelopes:

Format	Closure	Best For
Check format, security tinted	Gum flap	Inserter machine programs; moistenable seal
Check format, security tinted	Peel-and-seal	Hand-sealing check runs; no moisture needed
Check format, security tinted	Flip-and-stick	Fast continuous hand-sealing AP batches
Invoice format (#10)	Gum flap	Inserter machine billing programs
Invoice format (#10)	Peel-and-seal	Hand-sealing invoice and statement runs

All double window formats are available blank or custom-printed with your organization's logo and return address. Custom printing eliminates the need to include the return address in your Word template entirely , it is already on the envelope. For custom printing options, see custom printed envelopes.

★★★★★

"Does the job, no problems so far. I'd get these again"

Jessica | Verified buyer, Double Window Security Check Envelopes Flip and Stick Designed for QuickBooks Quicken Sage

Source: businessenvelopes.com product reviews

 

Why Business Envelopes for Double Window Envelopes

Business Envelopes has supplied double window envelopes for check mailing, billing, and invoice programs to US businesses since 1997. Every double window format in the catalog is stocked in both check and invoice configurations, with security tinting standard on check formats. Window positions are calibrated to align with standard accounting software output including QuickBooks, Sage, and Peachtree without document reformatting.

• No minimums on any order
• Free ground shipping to the contiguous 48 states on every order
• Blank stock ships same or next business day
• Custom-printed orders ship within 7 to 10 business days from proof approval
• All three closure types stocked: gum flap, peel-and-seal, flip-and-stick

For the complete window envelope range including single window, double window, and all standard business formats, see the Business Envelopes With Window: Complete Buyer's Guide and window envelopes.

 

When your 24 lb bond letterhead folds into thirds and slides into a #10 envelope, several things happen at once. The fold creates a visible crease across your letterhead design at the one-third and two-thirds points of the page. If you have a graphic element, a color bar, a watermark, or an important design feature that falls at those fold points, it will be creased. Design your letterhead knowing exactly where the one-third fold lines fall on an 8.5 x 11 page: at 3.67 inches and 7.33 inches from the top.

The envelope color and finish should coordinate with your letterhead stock. A cream or natural white letterhead going into a bright white envelope looks mismatched when the recipient pulls the document out. A premium cotton bond letterhead going into a thin economy envelope feels incongruous. The envelope is part of the first impression. It should reinforce the quality of what is inside, not undercut it.

For organizations sending letterhead correspondence at any volume, printed envelopes with your logo and return address carry the brand presentation from the moment the piece appears in the recipient's mail pile. A plain white #10 with a return address label says "we processed this." A printed #10 envelope with your logo says "this is from us, it is official, and it matters."

For billing and invoice correspondence where the letterhead carries the address information, window envelopes eliminate the addressing step entirely. The address printed on your invoice shows through the window. The envelope stock and the letterhead stock are still part of the same brand presentation, just with the window format for efficiency.

How to match your envelope to your letterhead

This is the practical matching guide that most stationery resources never provide.

Standard 8.5 x 11 letterhead on 24 lb bond:
Use a #10 envelope in white wove 24 lb stock. The paper weight matches. The finish matches. One standard First-Class stamp covers the weight in most standard correspondence scenarios. For custom printing, match the ink colors on the envelope to the brand colors on the letterhead.

Premium 28 lb or 32 lb bond letterhead:
Use a #10 envelope in white wove 24 lb or 28 lb stock. Going up in paper weight on the envelope increases per-piece cost and adds to total mailing weight. Most premium letterhead programs use 24 lb envelopes with 28 or 32 lb letterhead and the combination feels intentional without being wasteful.

Legal-size 8.5 x 14 letterhead (less common):
If your standard letterhead is legal size rather than letter size, a #10 envelope will not accommodate it folded in thirds cleanly. A legal-size sheet folds into thirds at 4.67 inches per panel, which fits in a #10 but with less clearance and a tighter fold. Alternatively, send legal-size correspondence flat in a 9 x 12 catalog envelope. The piece mails as a flat at a higher postage rate but arrives unfolded and more professional for formal correspondence.

Letterhead for contracts and legal filings:
For any correspondence where the document must arrive without fold marks, flat in a 9 x 12 catalog envelope is the correct approach regardless of letterhead paper weight. For filings and documents that genuinely cannot arrive damaged or moisture-affected, Tyvek envelopes in 9 x 12, 10 x 13, or 10 x 15 sizes deliver documents in original condition regardless of what happens in transit.

How to design letterhead that works in both print and digital

This is where many letterhead design projects create problems for themselves. A letterhead designed only for print often looks wrong as a PDF header. A design built only for digital often loses detail or color accuracy when printed.

The rules for a letterhead that works cleanly in both contexts:

Use CMYK color values for print, not RGB. RGB colors displayed on screen do not reproduce exactly in CMYK print. If your brand colors are specified only in RGB hex codes, convert them to CMYK values before giving the file to a printer. Colors that look vibrant on screen can print muddy or shifted without CMYK specification.

Use vector format for your logo. A logo in SVG, EPS, or AI format scales to any size without losing sharpness. A JPEG or PNG logo will print with visible softness at the resolution required for quality letterhead printing (300 DPI minimum). If you do not have a vector version of your logo, get one before committing to a letterhead design.

Set your document to 8.5 x 11 inches at 300 DPI. This is the standard for US letterhead. Any design built at a lower resolution will look soft when printed on quality stock. Any design built at a different page size will need to be reformatted when printing.

Keep a digital template version as a Word or Google Doc with the header embedded. This is the version your team uses to type letters. The header design is locked (not editable by the person typing the letter) but the body is fully editable. This prevents staff from accidentally modifying the branding elements while drafting correspondence.

Test your digital letterhead template for print before distributing it. Print one sheet on the paper stock you plan to use before ordering a quantity. Letterhead that looks correct on screen often needs minor adju

The fold-point problem: what no one tells you about letterhead design

This is the information that virtually no letterhead guide includes and that causes the most complaints after a letterhead print run.

When a standard 8.5 x 11 letterhead is folded in thirds to fit a #10 envelope, the fold lines fall at 3.67 inches and 7.33 inches from the top of the page. Any design element that crosses those lines will have a crease through it.

Common mistakes this creates:

A horizontal color bar at the bottom of the letterhead header lands at exactly the wrong height, creating a crease through the brand element when the letter is folded.

A watermark or background graphic centered on the page gets creased at both fold lines, breaking the visual twice.

A decorative border that runs the full perimeter of the page looks fine when flat but develops two horizontal crease marks when folded for mailing.

The fix is straightforward: before finalizing your letterhead design, draw two horizontal lines on your design file at 3.67 and 7.33 inches from the top. Make sure no critical design element, logo, color block, decorative line, or important graphic, crosses those points. Plain body text crossing a fold line is fine. Design elements crossing fold lines create a permanently creased letterhead that looks careless.

If your letterhead design must have elements across the full page depth, such as a left-column sidebar design, use a 9 x 12 catalog envelope to mail it flat rather than folded in thirds. The piece mails as a flat at higher postage but arrives without a crease compromising the design.

Letterhead for specific industries: what each one needs

Different industries have different expectations for letterhead content and format. Here is what each of the most common letterhead-using industries needs to know.

Law firms:
Formal and conservative design. Partner names on the letterhead are traditional for smaller firms. Header with firm name and logo, footer with full contact block and office address. Heavy paper stock (28 to 32 lb bond) is the norm. Correspondence that includes case-sensitive documents should be sent flat in a 9 x 12 envelope or Tyvek envelope rather than folded into a #10. Some states require bar association membership disclosure on official correspondence.

Healthcare practices:
Clean, clinical design. HIPAA compliance language may be required on correspondence carrying patient information. Opt for security tinted envelopes when mailing any correspondence that includes patient data, since security tinting prevents document contents from being visible through the envelope. Plain window envelopes without security tinting are not appropriate for patient correspondence containing PHI.

Financial services:
Conservative design, full contact block, regulatory disclosures where required by FINRA or SEC. For account statements and financial documents, window envelopes with security tinting keep account numbers and balances private in transit. Custom printed envelopes with the firm's logo help recipients recognize the correspondence as official before opening.

Nonprofits:
Letterhead that clearly identifies the organization's name, mission statement or tagline, and donation-related contact information where applicable. For fundraising correspondence, colored envelopes increase open rates. A pre-stamped reply envelope enclosed in the outgoing piece significantly improves donor response rates.

Real estate agencies:
Agent name and credentials, brokerage affiliation, and licensing information. For contracts and disclosure documents that need to arrive flat and signed, 9 x 12 catalog envelopes or 10 x 13 envelopes are the correct format.

What makes Business Envelopes different for letterhead and envelope matching

Business Envelopes has supplied commercial envelopes to US businesses, law firms, healthcare facilities, nonprofits, and direct mail operations since 1997. Here is what separates this catalog for organizations setting up a matched letterhead and envelope stationery system.

Custom printed envelopes matched to your brand. Printed envelopes with your logo, return address, and brand colors printed directly on the stock across every commercial size. PDF proof before production. Nothing prints until you approve it. Artwork stays on file permanently for reorders. The brand presentation that starts with your letterhead continues through the envelope.

Every envelope format in one catalog. Plain white for standard correspondence. Window and double window for billing and invoicing. Security tinted for financial and healthcare mail. Self seal closures for high-volume operations. Tyvek for documents that cannot arrive damaged. Colored envelopes for direct mail and fundraising programs. All from one supplier, all with free ground shipping.

No minimums, free shipping. Order exactly the quantities your program needs. A single box of 50 ships the same day as a case of 5,000. Free ground shipping on every order to the contiguous 48 states. Blank stock ships same or next business day. Custom printed stock ships 7 to 10 business days from proof approval.

Self seal for letterhead mailing programs. Any organization sending letterhead correspondence at volume benefits from self seal envelopes. No moisture activation, consistent sealing, no hand fatigue on large runs. Available in every commercial size with or without custom printing.

The bottom line on letterhead design

Get the essentials on the page without cluttering it. Choose 24 lb bond for standard use and 28 lb for premium correspondence. Design with the fold lines in mind so nothing important gets creased. Pair the letterhead with a matching printed envelope that carries your brand from the mail pile to the letter. Use window envelopes for any recurring mailing where the document already carries the address. Test everything, paper weight through printer, layout through fold, envelope through window alignment, before committing to a full print run.

A well-executed letterhead and envelope combination tells the recipient something important before they read a word: this organization is professional, consistent, and worth taking seriously.

Frequently asked questions 

What should a business letterhead include?
Company name and logo, full mailing address, primary phone number, email address, and website. Optional: tagline, social media, professional certifications, regulatory disclosures required by your industry. Keep it simple enough that the letterhead frames the letter content rather than competing with it.

What size is standard business letterhead?
8.5 x 11 inches (US Letter size). This is the standard for all US business correspondence. Legal-size letterhead at 8.5 x 14 inches exists but is uncommon and requires larger envelopes or flat-mail formats.

What paper weight should letterhead be printed on?
24 lb bond (90 gsm) is the professional standard that works in most office printers and presents well for client-facing correspondence. 28 lb bond (105 gsm) is the premium choice for law firms, financial advisors, and any organization where paper quality is part of the brand presentation. 20 lb bond is copy paper weight and is appropriate for internal use only.

What envelope goes with a standard 8.5 x 11 letterhead?
A #10 envelope (4.125 x 9.5 inches). A standard letterhead sheet folded in thirds fits cleanly in a #10 with appropriate clearance. For correspondence that must arrive unfolded, use a 9 x 12 catalog envelope.

Should my envelope match my letterhead paper weight?
They do not need to be identical, but they should feel compatible. A 24 lb bond envelope with a 24 lb bond letterhead is a clean match. A 24 lb envelope with a 28 or 32 lb letterhead is also acceptable and is the more common combination in premium stationery programs. Going higher on envelope weight adds postage cost at volume.

How do I avoid design elements getting creased when the letterhead folds?
Draw fold lines on your design file at 3.67 and 7.33 inches from the top of the page. Keep critical design elements, including logos, color bars, and decorative graphics, away from those lines. Elements that cross the fold lines will have permanent crease marks when the letter is folded for mailing. If your design requires full-page elements, mail flat in a 9 x 12 catalog envelope.

Can I print my own letterhead or should I use a commercial printer?
Both work. Printing in-house on a laser printer produces clean results on 24 lb stock. Commercial printing produces more consistent color accuracy, allows for spot color PMS matching, and can handle premium paper weights that some desktop printers cannot. For small volumes and internal use, in-house is practical. For client-facing correspondence and high-volume use, commercial printing is worth the investment.

What file format should I send to my printer for letterhead?
PDF is the standard for commercial printing. Create your file in your design software, convert to PDF with print-quality settings (300 DPI minimum, CMYK color mode, bleed marks if your design runs to the edge). Confirm with your printer before submitting whether they require bleed area and what that margin should be.

Home › Envelope Guides › Types of Office Envelopes

This guide covers every type of office envelope used in a business, which workflow each one is designed for, and what to look for before placing an order. Business Envelopes has supplied every format on this page to US businesses since 1997, blank or custom-printed, with free ground shipping and no minimum order.

 

Types of Office Envelopes: Quick Reference by Workflow

Office Task	Envelope Type	Why This Format
Standard correspondence	#10 plain white wove	Holds tri-folded 8.5x11 sheet, USPS letter rate $0.82
Billing, invoices, statements	#10 single-window, security tinted	Address shows from document inside, no separate addressing
Check and payroll mailing	#10 double-window, security tinted	Both payer and payee addresses show from the check form
Return mail programs	#9 reply envelope (nests in #10)	Fits inside #10 with 1/4 inch clearance, letter rate
Flat document mailing	9x12 or 10x13 booklet or catalog	Holds 8.5x11 flat without folding, USPS flat rate
Interoffice routing, filing	Clasp envelope (9x12 or 10x13)	Reusable, opens and reseals, circulates before archiving
Small-item storage	Coin envelope	Holds small parts, keys, USB drives, cash, seeds

 

Type 1: The #10 Envelope , Standard Office Correspondence

The #10 envelope is the foundation of every office mailing supply room. At 4-1/8 x 9-1/2 inches, it holds a standard 8.5 x 11 sheet folded into thirds with clearance on all sides. It qualifies for USPS First-Class letter rate at $0.82 per ounce in 2026. Nearly every type of routine business correspondence , letters, proposals, statements, notices , goes out in a #10.

The #10 comes in several configurations that affect which office task it fits:

• Plain white wove, gum flap: The baseline. Suitable for individually addressed outgoing correspondence, executive letters, and any mail where the address is printed directly on the envelope or applied via label.
• Plain white wove, peel-and-seal: Same format with a self-seal closure. Faster for hand-sealing moderate-volume batches. No moisture needed.
• Security tinted, gum flap or peel-and-seal: Interior reflex pattern blocks contents from view when held to light. The standard for any correspondence containing personal, financial, or legal information.

See the full range at #10 envelopes.

 

Type 2: The Window Envelope , Billing, Invoicing, and Automated Mail

A window envelope has a transparent poly-film panel on the lower-left face. The recipient's address, already printed on the enclosed document, shows through the window. No label. No printing on the envelope. The document and the envelope work as one system.

 

Single-window #10

One window for the recipient's address. The standard for billing programs, invoice mailing, monthly statements, insurance documents, and any outgoing program where the document already carries the recipient's address in a consistent position. When the accounting software prints the invoice with the address in the lower-left position of the tri-folded sheet, the single-window #10 handles addressing automatically with no extra step.

 

Double-window #10

Two windows: one for the recipient address, one for the sender's return address. Both addresses show from the enclosed document. This format exists specifically for check and payroll mailing programs. When QuickBooks, Sage, Peachtree, or compatible payroll software prints a check with both the payer and payee addresses on the form, the double-window #10 handles both addressing steps automatically.

 

Security tinting on window envelopes

Window envelopes for billing and check mailing should include security tinting. The window displays the address while the interior pattern blocks the financial content. Both functions work on the same envelope. See the full guide at Security Tinted Envelopes: What the Interior Pattern Actually Does and When You Need It.

★★★★★

"Never liked the lick envelopes peal and stick is the way to go"

Maya Smith | Verified buyer, #10 Window Business Envelopes Peel and Seal Security Tinted

Source: businessenvelopes.com product reviews

See all window formats at window envelopes.

 

Type 3: The #9 Return Envelope , Reply Mail Programs

The #9 envelope measures 3-7/8 x 8-7/8 inches. Its defining feature is that it fits inside a #10 outgoing envelope with approximately 1/4 inch of clearance on each side. The #9 is enclosed in the outgoing piece as a pre-addressed return envelope so the recipient can respond without providing their own envelope or address.

Every billing program that encloses a payment return envelope uses a #9. Every nonprofit mailing a donation appeal uses a #9. Every membership organization sending a renewal packet uses a #9. The format is the return mail standard because its dimensions are specifically sized to nest inside the #10 that goes out.

 

Type 4: Seal Types , Gum Flap, Peel-and-Seal, Flip-and-Stick

Seal type is the office envelope specification that causes the most operational problems when it is wrong. Choosing the right seal type before ordering prevents inserter jams, inconsistent seals, and wasted stock.

Seal Type	How It Works	Best For
Gum flap	Moistenable adhesive; water or sponge activates seal	Inserter machine programs; inserters are designed for gum flap
Peel-and-seal	Pressure-sensitive adhesive under liner; peel and press	Hand-sealing at moderate volume; no moisture needed
Flip-and-stick	Latex adhesive on flap and body; press together	Fastest hand-sealing for high repetition manual programs

If your office runs an inserter machine, confirm the seal type the equipment requires before ordering. Substituting peel-and-seal in a machine built for gum flap creates feed errors. See all self-seal formats at self seal envelopes.

 

Type 5: Clasp Envelopes , Interoffice Routing and Document Filing

The clasp envelope uses a metal butterfly clasp on the exterior flap that allows the envelope to be opened, resealed, and routed through multiple people before the document reaches its final destination. The same envelope can be opened and reclosed many times without losing closure integrity.

Clasp envelopes are the interoffice routing standard because no other envelope format handles the repeated open-reseal cycle reliably. HR departments route personnel files. Legal departments route contracts through multiple reviewers. Accounting departments route invoices through approval chains.

For outbound postal mail, clasp envelopes trigger a USPS non-machinable surcharge of $0.49 per piece because the exposed metal clasp cannot be processed by automated sorting equipment. Most offices reserve clasp envelopes for internal use and switch to plain gum-seal or peel-and-seal formats for any mailing entering the postal system. See all formats at clasp envelopes.

★★★★★

"I need to put several personal documents together to get my Real Id. Just 1 of these made the paperwork fit and close tightly."

Lisa Zimmerman | Verified buyer, 9x12 Brown Catalog Envelopes With Metal Clasp Closure

Source: businessenvelopes.com product reviews

 

Type 6: Flat-Document Envelopes , 9x12 and 10x13

When a document cannot arrive folded, the commercial #10 does not apply. Contracts with original signatures, certificates, reports, photographs, and any 8.5 x 11 content where fold lines compromise presentation need a flat-document envelope.

 

9x12 envelopes

The 9x12 holds an 8.5x11 sheet flat with approximately 1/4 to 1/2 inch of clearance on all sides. It always mails as a USPS flat at $1.63 per ounce in 2026. Available in white wove, brown kraft with clasp, and Tyvek formats. The 9x12 is the flat document standard for most offices.

 

10x13 envelopes

One inch larger on each dimension over the 9x12. Holds legal-size 8.5x14 sheets flat, accommodates standard 9x12 presentation folders with clearance, and handles thicker multi-page packets that are tight in a 9x12.

★★★★★

"I teach classes that require a great number of printed submissions. I give out these envelopes on the first day with the students' names on them, and they submit their papers in them. When I return the graded papers, the grades and comments are inside, allowing the students privacy. Good price, fast delivery."

V. J. Andrews | Verified buyer, 9x12 Brown Catalog Envelopes With Metal Clasp Closure

Source: businessenvelopes.com product reviews

 

Type 7: Coin Envelopes , Small-Item Office Storage

The coin envelope is a small-format envelope designed for holding small items: coins, keys, USB drives, pills, seeds, screws, paper clips, and any small component that needs individual labeling and storage. Most offices use coin envelopes in their supply rooms, reception desks, or administrative departments.

Coin envelopes come in multiple sizes and are available in white or brown kraft. The gum flap seals the contents securely. The surface accepts handwriting and labels for identification. See all coin envelope sizes at coin envelopes.

 

How Many Types of Office Envelopes Does a Business Actually Need?

Most small to medium offices can cover every mailing and routing need with four to five envelope types:

1. #10 plain white wove, peel-and-seal: General outgoing correspondence.
2. #10 single-window, security tinted, peel-and-seal: Billing, invoicing, and statement mailing.
3. #9 return envelope: Enclosed in outgoing billing or membership pieces as a pre-addressed return.
4. 9x12 catalog envelope: Flat-document mailing for contracts, reports, and certificates.
5. Clasp envelope (9x12): Internal routing and document circulation.

Organizations with payroll programs add the #10 double-window security tinted format. Organizations with inserter machines confirm gum flap compatibility before ordering. See the complete catalog at all sizes envelopes and all standard letter-size formats at regular envelopes.

 

Why Business Envelopes for Office Envelope Orders

Business Envelopes has supplied every type of office envelope to US businesses since 1997. The full range of #10, window, double-window, #9, clasp, flat-document, and coin envelope formats is stocked blank or custom-printed. Window positions are specced to match the standard document output of QuickBooks, Sage, Peachtree, and compatible accounting software. Security tinting is a standard option across all window and non-window formats.

• No minimums on any order
• Free ground shipping to the contiguous 48 states on every order
• Blank stock ships same or next business day
• Custom-printed orders ship within 7 to 10 business days from proof approval
• All seal types stocked: gum flap, peel-and-seal, flip-and-stick