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The 10 x 13 white booklet envelope is one step up from the standard 9 x 12 in both dimensions. That extra inch of height and width produces a full additional inch of clearance on each side of an 8.5 x 11 document, which matters when the content stack is thick, when the documents include a cover sheet plus a multi-page attachment, or when legal-size 8.5 x 14 sheets need to be mailed with a single fold rather than the double fold required in a 9 x 12. Built from 28 lb bright white wove stock with a peel-and-seal closure and a booklet-style opening on the long (13-inch) edge. Available blank for same or next day shipping or with custom logo and return address printing from Business Envelopes. Free shipping on every order with no minimums.
The 9 x 12 envelope holds an 8.5 x 11 sheet flat with a quarter inch of clearance on each side. For a single document or a thin packet that's adequate. When the content stack includes a folded cover letter plus multiple enclosures, when the documents are near the maximum capacity of a 9 x 12 and the envelope body starts to feel strained, or when the mailing regularly includes legal-size 8.5 x 14 sheets that need a shorter fold, the 10 x 13 is the right specification. The 9.75 x 12.25 inch interior provides three quarters of an inch more clearance on each side than a 9 x 12, which means thicker stacks load without resistance, nothing compresses against the envelope walls, and the piece arrives flat rather than bowed.
Common use cases for the 10 x 13 white booklet format include thick client correspondence packets from law firms and accounting practices, marketing packages with a cover letter plus multiple printed inserts, real estate document submissions, academic and institutional mailings with large-format certificates or diplomas, and any recurring program where the 9 x 12 runs visibly close to its content limit.
Brown kraft is the traditional choice for large-format flat-document mailing. White stock at this size is the right choice when the presentation of the outgoing piece matters before it's opened. A bright white 10 x 13 envelope accepts printed addressing and custom logo printing more crisply than kraft, looks more intentional in a business-to-business or client-facing context, and pairs naturally with white or branded document contents rather than creating a color contrast between the envelope and the materials inside. The 28 lb weight provides the same structural rigidity as kraft at this size. This isn't a lightweight white envelope. It holds its shape through postal sorting and arrives with the same structure it had when it left.
For the open end version of this envelope that loads from the short (10-inch) edge rather than the long edge, see the 10 x 13 White Open End Peel and Seal. For the same 10 x 13 size in brown kraft with a metal clasp closure, see the 10 x 13 Brown Kraft Clasp envelope. For maximum durability on documents that cannot arrive torn or wet, see the 10 x 13 Tyvek Peel and Seal. For the standard 9 x 12 size in the same white booklet peel-and-seal format, see the 9 x 12 White Booklet Peel and Seal. Ships same or next business day on blank stock. Custom printed orders ship in 7 to 10 business days from proof approval.
Perfect for my needs! Would buy again. Business Envelopes did a great job with the printing.