what are the sizes of usps flat rate boxes?

Each envelope is unique in size and structure and has differing use cases. There are 5 different options for USPS Flat Rate Envelopes. That being said, let's dive into the different USPS Priority Mail Box and Envelope options. With a USPS Flat Rate Box or Envelope, you will be able to ship any item of any weight up to 70lbs to any location for the same price assuming it fits properly, without any bulging, within its designated box or envelope. (Ship online with enhanced Click-N-Ship service and get lower Commercial Rates. Mail from Post Office locations or online from your home or business. If using non-customized boxes is not a deal breaker for you, USPS Flat Rate Shipping is a great tool to spend less on shipping. Priority Mail Express Flat Rate lets you ship packages up to 70 lbs to any state at the same price. This can be a drawback for some because, unless you are a high volume shipper, you cannot get customized boxes with specific branding. In order to have access to the USPS Priority Mail Flat Rate pricing, you must use one of USPS designated Flat Rate Boxes you cannot use just any box of the same dimensions. You can pick them up at any post office or USPS will actually ship the boxes opens in new tab open_in_new to you for free. One of the many benefits of shipping with USPS Flat Rate Boxes is that the boxes themselves are free. This is a Priority Mail Flat Rate Boxes Variety Pack - VARIETY FRB consisting of: - 1 Small Flat Rate Box 5-3/8' (L) x 8-5/8' (W) x 1-5/8' (H) - 1 Medium Flat Rate Box (top loading) 11' (L) x 8-1/2' (W) x 5-1/2' (H) - 1 Medium Flat Rate Box (side loading) 11-7/8' (L) x 3-3/8' (W) x 13-5/8' (H) - 1 Large Flat Rate Box 12' (L) x 11-3/4' (W) x 5.

How You Can Use USPS Flat Rate Boxes and Envelopes to Save on Shipping

What are the sizes of usps flat rate boxes?