Filter products based on envelope type (e.g., standard, postcard, international, etc.).

Business Supplies Free Shipping Supplies Priority Mail Flat Rate® Envelope Single or Pack of 10 12-1/2" (L) x 9-1/2" (H)

Free Shipping Supplies Priority Mail Flat Rate® Envelope Single or Pack of 10 12-1/2" (L) x 9-1/2" (H)

Shop our selection of Business Supplies on the USPS.com Postal Store

Welcome to the Postal Store at USPS.com! Order stamps, shipping supplies, and unique items only available from the United States Postal Service.

Free shipping supplies mailed via USPS Ground Advantage™ and ship within 2-5 business days. If your local Post Office® is unable to fulfill your order of expedited shipping supplies within 1-2 business …

Business Supplies Free Shipping Supplies Priority Mail Express® Poly Envelopes Pack of 10 15" (L) x 11-5/8" (W)

Filter for products by a variety of themes, including Nature, History, Children and more. Filter for stamps by the value of the stamp, from 1¢ additional postage to Priority Mail Express Stamps. Browse …

Shop our selection of Boxes, Free Shipping Supplies Shipping Supplies on the USPS.com Postal Store

Free Shipping Supplies Envelopes Priority Mail® Forever Prepaid Flat Rate Envelope Includes Customer's Return Address 12-1/2" (L) x 9-1/2" (H)