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10 x 13 Brown Booklet Envelopes Gum Flap

10 x 13 Brown Booklet Envelopes Gum Flap

10 x 13 Brown Booklet Envelopes, Gum Flap

The 10 x 13 brown booklet envelope is the large-format kraft paper mailer for flat-document correspondence that needs more room than a 9 x 12 provides. Built from 28 lb brown kraft paper with a booklet-style opening on the long (13-inch) edge and a moistenable gum flap closure, this envelope handles thick document packets, legal-size submissions, flat printed materials, and any mailing where the 9 x 12 interior starts to feel tight around a full content load. Available blank or with custom logo and return address printing from Business Envelopes. Free shipping on every order with no minimums.

10x13 Envelope Size and Specifications

Envelope size: 10 inches wide by 13 inches tall
Interior enclosure space: 9.75 x 12.25 inches
Orientation: Booklet style, opens on long (13-inch) edge
Flap construction: Rectangular flap, windowless face
Paper stock: 28 lb brown kraft, sulphite base
Closure: Moistenable gum flap
Printer compatibility: Address labels and adhesive printing apply cleanly to kraft surface
USPS classification: Flat-mail rate, postage based on total weight
Ships: Same or next business day on blank stock

10 x 13 Envelopes: When This Size Is the Right Call

The 9 x 12 envelope holds an 8.5 x 11 sheet flat with a quarter inch of clearance on each side. For most flat-document mailings that's workable. Where it stops being workable is when the content stack is thick enough to push against the envelope walls, when the piece includes multiple attachments that together exceed the 9 x 12's comfortable capacity, or when legal-size 8.5 x 14 sheets need to be sent without the kind of double fold that creases the document at a visible point in the text area.

The 10 x 13 solves all three of those situations. The 9.75 x 12.25 inch interior gives a full extra inch of clearance on each side over the 9 x 12, thick stacks load without compressing against the walls, and a legal-size sheet folded once in half produces a 7 x 8.5 panel that fits with room to spare. The organizations that keep 10 x 13 envelopes in stock alongside their 9 x 12s tend to be law firms, accounting practices, real estate offices, and corporate communications departments where the occasional thick outbound packet is a regular operational need.

Brown Booklet Envelopes: What Brown Kraft Does That White Doesn't

Brown kraft has a structural advantage at the 10 x 13 size. The natural kraft fiber composition gives the 28 lb stock a higher tear resistance and puncture resistance than 28 lb white sulphite at equivalent weight. The kraft surface also communicates a working document envelope rather than a presentation piece, which is the right signal for legal filings, interoffice routing, document storage, and institutional correspondence where appearance is secondary to durability and function. The brown color also makes the envelope less likely to show handling marks or surface scuffs from postal processing, which matters on pieces that go through multiple handling points before delivery.

For the 10 x 13 format in white stock with a peel-and-seal closure, see the 10 x 13 White Booklet Peel and Seal. For the 10 x 13 in brown kraft with a metal clasp and gum flap dual closure, see the 10 x 13 Brown Kraft Clasp envelope. For maximum protection with Tyvek material at this size, see the 10 x 13 Tyvek Peel and Seal. Browse the complete clasp and large-format envelope range for all formats in this size family. Ships same or next business day on blank stock. Custom printed orders ship in 7 to 10 business days from proof approval.

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