N Get the packaging, labels, and forms you need for a well-stocked mailroom free of charge at ®. N One price regardless of weight or distance, up to 70 pounds. N Available 365 days a year to most locations, including Sundays and holidays for an additional fee. N Our fastest service for time-sensitive letters and documents. Domestic Express Mail Flat-Rate Packaging Information N Delivery to Alaska, Hawaii, Puerto Rico, Guam, or the U.S. 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 Priority Mail Flat Rate® Medium Box - 1 Single, Pack of 10 or 25 11-1/4' (L) x 8-3/4' (W) x 6' (H) 0.00 Priority Mail Flat Rate® Medium Box - 2 Single, Pack of 10 or 25 14-1/8' (L) x 12' (W) x 3-1/2' (H) 0. Priority Mail Large Flat-Rate Box (APO/FPO/DPO)

Priority Mail Medium Flat-Rate Box (FRB2) Priority Mail Medium Flat-Rate Box (FRB1) Domestic Priority Mail Flat-Rate Packaging Information With flat-rate shipping, there’s no need to weigh anything that can fit (up to 70 pounds) if it is shipped domestically.Īll USPS ® Priority Mail and Express Mail packaging material is available free of charge at Post Offices™ or may be ordered online at no additional cost and shipped to any home or business. Our Express Mail ® Flat-Rate Envelope eliminates the need to weigh contents and calculate postage for anything that can fit into the Flat-Rate Envelope.

Prices vary by product, as shown in the table below.

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 small flat rate box usps