What is a flat rate box?

Order Flat Rate Boxes from USPS for FREE now:

-Small Flat Rate Box (roughly 12 X 12 X 6)

-Medium Flat Rate Box 1 (roughly 11 X 8 X 6)

-Medium Flat Rate Box 2 (roughly 12 X 3 X 14)

-Large Flat Rate Box (roughly 12 X 12 X 6)

-Large Flat Rate Board Game Box (roughly 11 X 3 X 23)

What is a Flat Rate Box?

When using this postal option you'll want to use USPS's special Flat Rate Boxes. USPS provides these boxes free of purchase. Just go to your local post office to pick up the correct box or click the link above to place an order through USPS's website to have them delivered directly to your door.

When opening an order for purchase, the Flat Rate options will show automatically without needing to enter any of the package's dimensions. This is because the weight of the box does not matter and the system automatically uses the dimensions. All we need to create a price is a To Zip and a From Zip.

Read more about the individual options below including common uses and sizes.

Small Flat Rate Box

Inside Dimensions: 5-3/8"(L) X 8-5/8"(W) X 1-5/8"(H)

Outside Dimensions: 8-11/16"(L) X 5-7/16"(W) X 1-3/4"(H)

This very small box is a flat, side-loading, rectangular box roughly the size of three DVD cases stacked. You can use this for jewelry, electronics, or other small items that need to be shipped quickly.

Medium Flat Rate Box 1

Inside Dimensions: 11"(L) X 8-1/2"(W) X 5-1/2"(H)

Outside Dimensions: 11-1/4"(L) X 8-3/4"(W) X 6"(H)

This medium size box is sized perfect for model cars, shoes, and taller items. The package folds into a tall, top-loading, rectangular box.

Medium Flat Rate Box 2

Inside Dimensions: 11-7/8"(L) X 3-3/8"(W) X 13-5/8"(H)

Outside Dimensions: 12"(L) X 3-1/2"(W) X 14-1/8"(H)

This medium tall, side-loading, rectangular box is perfect for garments, board games, books, and other thinner items.

Large Flat Rate Box

Inside Dimensions: 12"(L) X 12"(W) X 5-1/2" (H)

Outside Dimensions: 12-1/4"(L) X 12-1/4"(W) X 6"(H)

The large flat, top-loading, rectangular box is good for large and/or heavier items such as books or clothing.

Large Flat Rate Board Game Box

Inside Dimensions: 11-3/4"(L) X 3-1/8"(W) X 23-11/16"(H)

Outside Dimensions: 11-7/8"(L) X 3-1/4"(W) X 24-1/16"(H)

This large, tall, side-loading, rectangular box can fit two average-sized board games. This packaging is ideal for thinner and/or heavier items.