Priority Mail, including Priority Mail Flat Rate shipping products, has fast shipping times (2-3 days) with flexible prices. Get free flat rate boxes and print postage labels online.

Shop our selection of Priority Mail Shipping Supplies on the USPS.com Postal Store

The Priority Mail Flat Rate® Large Box is a quick, easy, and convenient way for you to ship Priority Mail® packages. It features predetermined rates regardless of weight (domestically) or …

Shop our selection of Priority Mail Shipping Supplies on the USPS.com Postal Store

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

Compare USPS shipping options like Priority Mail Express, Priority Mail, First-Class Mail, and USPS Ground Advantage to find the service that's right for you.

Priority Mail ® service offers a variety of Flat-Rate Boxes and Envelopes that ship for the same price to any domestic address, regardless of how much they weigh or how far they’re going.

Priority Mail Boxes Priority Mail® Forever Prepaid Flat Rate Large Box Includes Customer's Return Address 12-1/4" (L) x 12" (W) x 6" (H)

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

If you're going to use Priority Mail and Priority Mail Express service, the boxes come in standard sizes and you can get them at your Post Office ™ location or order online, free!