Shop for #9 envelopes and get FREE shipping! Choose from blank or printed #9 envelopes, in a variety of styles and colors. These #9 envelopes, measuring 3 7/8" x 8 7/8 ", are the perfect envelopes for mailing checks, payments, or other documents.
Generally used for business envelopes, the #9 envelope will fit neatly inside a standard #10 envelope and is often sent with invoices or statements and used for return mailings such as payments or checks. These envelopes come in a variety of options, including window, non-window, security tint, self-seal and traditional gummed flap.