#10 Envelope

#10 envelopes are a standard size commonly used in business and personal correspondence. Measuring approximately 4.125″ by 9.5″ (105mm by 241mm), these envelopes are ideal for enclosing standard letter-sized (8.5″ x 11″) paper folded into thirds. With enough space for a return address and the recipient’s address, #10 envelopes are a popular choice for mailing invoices, statements, direct mail, and personal letters. Their practical design often includes a standard commercial flap, making them easy to fill and secure.