Set of 1 9-5/8" (L) x 7-3/4" (W) x 6-1/4" (H) $0.00 Priority Mail® Forever Prepaid Flat Rate Large Box Includes Customer's Return Address 12-1/4" (L) x 12" (W) x 6" (H) $31.40

Use USPS PO Boxes for business or personal use. Learn how to reserve, rent, renew, and manage a PO Box online, as well as how much a PO Box costs.

Pack of 10 15" (L) x 9-1/2" (H) $0.00 Priority Mail Flat Rate® Small Box Single, Pack of 10 or 25 8-11/16" (L) x 5-7/16" (W) x 1-3/4" (H) $0.00

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3-1/2" (L) x 5-1/2" (W) $6.90 Military Care Kit 6 Boxes, Tape, Labels $0.00 Results Per Page: 1 2 3 4 5 6 7 8 9 10

The Priority Mail Flat Rate® Medium Box is an easy way to ship featuring predetermined rates regardless of weight (domestically) or destination. This item ships in single, or a pack of 10 or 25 boxes.

Select another box size or Post Office™ location to find an available box. If you choose to apply for the waitlist, we will send general details on timing and upcoming availability in your waitlist confirmation …

Welcome to USPS.com. Track packages, pay and print postage with Click-N-Ship, schedule free package pickups, look up ZIP Codes, calculate postage prices, and find everything you need for …

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 Boxes, Priority Mail Shipping Supplies on the USPS.com Postal Store