How Much Do USPS Flat Rate Boxes Cost?
We've broken the pricing into the table below. Note: The rates below reflect USPS Commercial Plus Pricing, which is available when shipping via EasyPost. If you're interested in signing up for USPS Commercial Plus Pricing, contact us and we can set you up.

- Mailing Box BX20 - 500 x 440 x 350mm - 10 Pack. Mailing Box BX23 - 485x 385x 265mm - 10 Pack. Mailing Box BX5 - 405x 300 x 255mm.
- View our available boxes of awesome. Check out awesome box themes in categories like gear, kitchen, apparel, and many more.

USPS Priority Mail Flat Rate Options
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Last Updated: January 24, 2021.
Type | Size | EasyPost Predefined Package | Price |
---|---|---|---|
Letter Envelope | 12 1/2' x 9 1/2' | FlatRateEnvelope | $7.40 |
Gift Card Envelopes | 10' x 7' | FlatRateGiftCardEnvelope | $7.40 |
Window Envelopes | 10' x 6' | FlatRateWindowEnvelope | $7.40 |
Small Envelopes | 10' x 6' | SmallFlatRateEnvelope | $7.55 |
Padded Envelopes | 12 1/2' x 9 1/2' | FlatRatePaddedEnvelope | $8.00 |
Legal Envelopes | 15' x 9 1/2' | FlatRateLegalEnvelope | $7.70 |
Small Box | 8 11/16' x 5 7/16' x 1 3/4' | SmallFlatRateBox | $7.90 |
Medium Boxes | 11 1/4' x 8 3/4' x 6' or 14' x 12' x 3 1/2' | MediumFlatRateBox | $13.75 |
Large Box | 12-1/4' x 12-1/4' x 6' or 24-1/16' x 11-7/8' x 3-1/8' | LargeFlatRateBox | $19.30 |
APO/FPO Box | 12-1/4' x 12-1/4' x 6' | LargeFlatRateBoxAPOFPO | $17.80 |
Small Post Beam
Note: Rates are ESTIMATED. When you purchase postage, these rates may differ.
Post Boxes
If you have any questions about our Commercial Plus pricing use the button below to contact us.
