10 x 15 Envelopes

The 10 x 15 is the largest standard catalog envelope in the commercial lineup. Ten inches wide by fifteen inches tall. An 8.5 x 11 sheet fits flat inside with three quarters of an inch of clearance on each side and three full inches of vertical clearance above it. A legal-size 8.5 x 14 sheet fits with room above. Multiple documents, thick report packets, bound booklets, and large-format marketing materials load without compression and arrive flat. This category carries two formats at this size: a 28 lb brown kraft catalog envelope with metal clasp and gum seal dual closure, and a Tyvek peel-and-seal open-end envelope for maximum protection on documents that cannot be damaged in transit. Both ship from Business Envelopes with free shipping and no minimums.

10 x 15 Envelope Specifications

• Envelope size: 10 inches wide by 15 inches tall
• Interior enclosure space: approximately 9 3/4 x 14 3/4 inches
• Orientation: Open end (catalog style), opens on short (10-inch) edge, loads from top
• Available materials: 28 lb brown kraft with metal clasp, or DuPont Tyvek
• USPS classification: Flat-mail rate, postage based on total weight
• Ships: Same or next business day

10 x 15 Envelopes: Two Formats for Different Applications

10 x 15 Brown Catalog Envelopes, Metal Clasp

The brown kraft clasp format is built for institutional, archival, and repeated-use applications. The 28 lb brown kraft paper gives the envelope more structural rigidity and tear resistance than lighter paper stock at this size. The metal clasp closure bends down over the gum-sealed flap and locks the envelope shut mechanically, independently of the adhesive seal. This dual closure handles the heavier content loads this size typically carries: multiple report pages, bound documents, presentation packets, thick proposal sets, and any contents where the envelope needs to stay closed under the weight of its own contents in transit. The clasp also makes the envelope genuinely reusable: straighten the prongs, open the flap, remove contents, reinsert, close the flap, bend the clasp back down. For archival programs, active project files, and any workflow where the same envelope goes in and out of use repeatedly, the clasp format handles it correctly.

10 x 15 Tyvek Envelopes, Peel and Seal

Tyvek is a DuPont spunbonded polyethylene material. It doesn't tear under force. It doesn't absorb moisture or delaminate when wet. A 10 x 15 paper envelope with a heavy content load can fail at the seams or corners under stress during postal sorting. A 10 x 15 Tyvek envelope in the same conditions holds its contents intact because the material stretches under stress rather than tearing. The peel-and-seal closure on the Tyvek format bonds on contact pressure with no moisture, which is the right closure for an envelope that will be sealed in volume and handled repeatedly in transit. For legal filings, medical records, architectural drawings, and any document whose replacement cost or importance justifies premium envelope protection, the Tyvek format is the correct specification at this size.

10x15 Envelope Size: Where This Format Fits in the Catalog Size Range

The standard large flat-document mailer is the 9 x 12. Most businesses stock it for everyday flat-document correspondence. The 10 x 13 gives one additional inch on each dimension for thick packets and legal-size documents. The 10 x 15 is the step above the 10 x 13: the same 10-inch width, two additional inches of height. The extra height is what makes the difference for the specific use cases this size handles best.

Brochures, catalogs, and marketing materials that are taller than 12 inches, posters folded to a flat format, architectural drawings in a standard tri-fold, presentation packets with multiple enclosures, and research binders with front covers all fit in the 10 x 15 with clearance. In the 10 x 13 or the 9 x 12, the same contents are either too tight, require an additional fold that creases the material, or compress against the envelope walls enough to stress the seam on a long transit.

Why Organizations That Mail at This Size Stock Their 10 x 15 Envelopes Here

The 10 x 15 is a specialty format. Most retail office supply programs don't stock it consistently. When they do carry it, the quantities are limited and the availability is unreliable. For an organization that sends research submissions, government filings, real estate transaction documents, or institutional correspondence at this size on a regular schedule, running out of envelopes between retail restock cycles is an operational problem that doesn't need to exist.

We've stocked the 10 x 15 in both brown kraft clasp and Tyvek peel-and-seal since the beginning of this catalog. Same-day or next-day shipping on blank stock. Free ground shipping across the contiguous 48 states on every order regardless of quantity. No minimums means you can order exactly what you need without committing to a case quantity you don't have room for. Bulk pricing reduces the per-unit cost automatically as quantities increase, so larger orders get the most favorable pricing without any negotiation or account setup. For organizations running high-volume programs at this size, request a bulk quote here and we'll have pricing back to you the same day. Browse the complete clasp envelope range and the full Tyvek envelope catalog for all available sizes and configurations.

Frequently Asked Questions About 10 x 15 Envelopes

Q: What fits in a 10 x 15 envelope?

An 8.5 x 11 sheet fits flat with three quarters of an inch of clearance on each side. Legal-size sheets, thick packets, catalogs, and large marketing materials fit without folding.

Q: What is the difference between the clasp and Tyvek versions?

The clasp version is 28 lb brown kraft with metal clasp and gum seal, reusable. Tyvek is tear-resistant and moisture-resistant, suited for documents that cannot be damaged in transit.

Q: Is there a minimum order quantity?

No minimums. Order any quantity. Free ground shipping on every order across the contiguous 48 states. Bulk pricing applies automatically as quantities increase.

Q: How quickly do 10 x 15 envelopes ship?

Same or next business day on all blank stock in both formats. Standard ground shipping delivers to most addresses in the contiguous 48 states within 2 to 5 business days.

Q: Can the clasp envelope be reused?

Yes. The metal clasp opens by straightening the prongs, allows content removal and reinsertion, and re-closes by bending the prongs back down. The clasp functions independently of the gum seal.

Q: What is the USPS postage rate for 10 x 15 envelopes?

10 x 15 envelopes mail at USPS flat-mail postage rates, which are higher than letter rates. Postage is calculated by total weight. Heavier contents cost more to mail.

Q: How does the 10 x 15 compare to the 10 x 13 size?

Two inches taller than the 10 x 13 at the same width. The extra height accommodates taller documents, deeper packets, and materials that exceed the 10 x 13's comfortable capacity.

Q: Is Tyvek waterproof?

Tyvek is moisture-resistant rather than fully waterproof. It does not absorb water or delaminate when wet. It provides significantly better moisture protection than paper stock at equivalent weights.