
Let’s take a look at the dimensions of each of these boxes. There is also a Medium Flat Rate Box, a Small Flat Rate Box, and a Flat Rate Envelope. The most popular size is the Large Flat Rate Box, which is available in two different versions.

USPS Flat Rate Boxes come in a variety of sizes. Here are the dimensions for the various sizes of USPS flat rate boxes: The USPS website offers a tool to help you determine which size flat rate box is right for your shipment. The most popular flat rate box is the medium flat rate box. USPS flat rate boxes come in a variety of sizes.

In this blog post, we’ll break down the dimensions of the different Flat Rate boxes so you can make the best decision for your shipment.

If you’re shipping via USPS Flat Rate, you’ll need to know what size boxes are available and which one will best fit your needs.
