The Priority Mail® Medium Flat Rate Box - 1 is a quick, easy, and convenient way for you to ship USPS Priority Mail packages. The Priority Mail Medium Flat Rate Box features predetermined rates regardless of weight (domestically) or destination, similar to the Flat Rate Envelope.
Inside Dimensions: 11" x 8-1/2" x 5-1/2"
Outside Dimensions: 11-1/4" x 8-3/4" x 6"
- Can be used for Domestic Priority Mail ($12.65) and International Priority Mail ($42.25 to Canada - $61.75 to all other countries, 20 lb weight limit applies)
For more information, please visit the Shipping page