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The open end format at 10 x 13 inches loads from the top. The flap runs across the full 10-inch width at the short edge and documents drop in from above, which makes this the top-loading format for flat document mailing at this size. An 8.5 x 11 sheet fits flat with three quarters of an inch of clearance on each side. A legal-size 8.5 x 14 sheet fits with a single fold and room above it. Books, catalogs, bound brochures, multi-page packets, and hardbound materials load without compression against the envelope walls. One buyer uses these specifically for mailing books and calls the quality great. Built from 28 lb white wove with a peel-and-seal closure that bonds on contact pressure without moisture. Available blank or with custom logo and return address printing from Business Envelopes. Free shipping, no minimums.
The standard large flat-document envelope is the 9 x 12. For most flat mailings it's the right size. The 10 x 13 is one inch wider and one inch taller, which produces nearly an inch of additional clearance on each side of an 8.5 x 11 sheet. That extra clearance is what makes the difference when the contents are thick, when the packet includes a cover sheet plus multi-page attachments, or when the mailing regularly includes materials like bound booklets, catalogs, or books that approach or exceed the comfortable capacity of a 9 x 12.
The 28 lb stock matters at this size. A 10 x 13 envelope holds more content than a 9 x 12, and heavier contents exert more pressure on the envelope walls and corners under postal handling. The 28 lb wove construction is heavier and more structurally rigid than 24 lb stock, which means the piece holds its shape and arrives flat rather than bowing or creasing under content weight in transit. For any outgoing piece where document condition on arrival matters, the 28 lb stock is the correct specification at this size.
Both the open end and booklet versions of the 10 x 13 are 10 x 13 inches with the same 9.75 x 12.25 inch interior and the same 28 lb peel-and-seal construction. The orientation is the difference. The booklet format opens on the long (13-inch) edge: wide side opening across the full 13-inch face, contents slide in from the side. The open end format opens on the short (10-inch) edge: the flap runs across the 10-inch width at the top and documents load from above. If your insertion workflow runs top-down, stacks documents vertically, or uses top-loading equipment, the open end format is the right choice. If your workflow loads from the side horizontally, the booklet format is the correct orientation. Either way the size, stock, closure, and postage classification are identical.
For the same 10 x 13 white format in a booklet orientation (side-loading), see the 10 x 13 White Booklet Peel and Seal. For maximum durability on the same size with Tyvek material, see the 10 x 13 Tyvek Peel and Seal. For the 9 x 12 white open end in peel-and-seal format, see the 9 x 12 White Open End Peel and Seal. Browse the complete self-seal envelope range for all peel-and-seal formats across every size. Ships same or next business day on blank stock.
I was very excited when my order arrived a few days after ordering. The printing was nicer than expected. Thank you!
I use this for mailing books. I find it very effective. Quality is great!