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#9 envelopes are a preferred choice for many business and personal needs, slightly smaller than the typical #10. Measuring around 3.875″ by 8.875″ (98.4mm by 225.4mm), they are adept at holding documents slightly smaller than standard letter-sized (8.5″ x 11″) paper, or can comfortably fit within a #10 as a return envelope. Ideal for mailing checks, invoices, or reply mail, their design usually incorporates a traditional commercial flap, facilitating effortless filling and sealing. Their size and structure make them especially useful for business return purposes or for any mailing that desires a professional touch.
Sticky Flaps is your go-to source for full-color custom envelopes, printed on demand in the United States of America.