Use our Priority Mail Flat Rate Envelopes or Boxes that come in standard sizes so you don't have to worry about measuring them. When sealing a Flat Rate Envelope or Box, the container flaps must be …

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.

Weight restrictions for Priority Mail International Large and Medium Flat Rate Boxes are 20 pounds, and 4 pounds for Priority Mail International Flat Rate Envelopes and Small Flat Rate Priced Boxes.

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 …

You can check out the starting prices for many of our domestic and international mailing and shipping options below or visit the Postal Explorer ® website to review the full USPS® Price List.

The Priority Mail Flat Rate® Small Box is about the same size and shape as three stacked DVD cases. It is perfect for jewelry, electronics, event tickets, or other small items that need expedited shipping.

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

For one low price, you can mail any amount of material to a U.S. destination, of any weight up to 70 lbs that will easily fit in the flat rate envelope or box. Domestic packages may not weigh more than 70 …

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Shipping Supplies Boxes 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