USPS Priority Mail Regional Rate boxes are specific kinds of packaging that you can get from the Post Office's website. To ship with these boxes, you have to buy the specific type of Regional Rate postage that matches the type of box you're using. You can see learn more and see the rates here.

It's a common misconception that Regional Rate is a better deal than using your own packaging, but that's only true if you don't have access to Priority Mail Cubic. Shipping with Regional Rate is always more expensive than if you used your own similarly-sized box, or a free "mailing box" from USPS

Here's why:

Priority Mail Cubic is cheaper than Regional Rate Box A

The Priority Mail Regional Rate A Box comes in two sizes:

  • Priority Mail Regional Rate Box A1 Box: 10 x 7 x 5 inches
  • Priority Mail Regional Rate Box A2 Box: 13 x 11 x 2.5 inches

Both of these boxes are just barely bigger than 0.2 cubic feet in volume.

If you used your own box which was *almost* the same size (smaller by even just a tenth of an inch like 10 x 7 x 4.9 inches or 13 x 11 x 2.4 inches), then the boxes would be in the 0.2 cubic feet pricing tier for Priority Mail Cubic, and would save you anywhere from $0.31 cents to $4.72 on every box you shipped, depending on how far it's going:

USPS offers free "Mailing Boxes" you can use instead of Regional Rate A:

Use your own box for a custom size that fits your products, or USPS offers two free "mailing boxes" that are the cubic 0.2 size:

Priority Mail Cubic is cheaper than Regional Rate Box B

The Priority Mail Regional Rate B Box comes in two sizes: 

  • Priority Mail Regional Rate Box B1 Box: 12.25 x 10.5 x 5.5 inches
  • Priority Mail Regional Rate Box B2 Box: 16.25 x 14.5 x 3 inches 

Both of these are just slightly bigger than 0.4 cubic feet in volume.

If you used your own box that was just slightly smaller (like 12.25 x 10.5 x 5.4 inches or 16.25 x 14.5 x 2.9 inches), then they would be in the 0.4 cubic feet pricing tier of Priority Mail Cubic and would save you anywhere from $0.10 cents to $9.64, depending on how far you're shipping it:

USPS offers free "Mailing Boxes" you can use instead of Regional Rate B:

Use your own box for a custom size that fits your products, or USPS® offers two free "mailing boxes" that are the cubic 0.4 size:

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