#10 Envelopes - Window, Security & Business Mailing Styles

The #10 envelope (4-1/8" x 9-1/2") is the most widely used size for business correspondence, billing statements, and everyday mailing. Designed to hold standard letter-size documents folded into thirds, #10 envelopes are the professional choice for invoices, checks, contracts, and corporate communications. Our selection includes a wide range of window envelopes, security tint envelopes, self-seal styles, and double-window options to match any mailing requirement. Whether you need envelopes for high-volume office use, confidential financial documents, or polished customer communications, you'll find dependable quality and consistent performance.

Dimensions: 4-1/8" x 9-1/2"   |   Max. Enclosure Size: 3-7/8" x 9-1/4"