Number 10 Envelopes
#10 Envelope Size: Ideal for Business and Mailing Needs
The #10 envelope size (4 1/8" x 9 1/2") is the most widely used envelope for mailing standard letters, documents, and business correspondence. This size is designed to fit an 8.5" x 11" letter-sized paper folded into thirds, making it the go-to choice for a variety of mailing purposes. Whether you need to send invoices, marketing materials, or general correspondence, the #10 envelope is the perfect solution for professional and personal use.
Dimensions: 4-1/8" x 9-1/2", Max. Enclosure Size: 3-7/8" x 9-1/4"