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![USPS Flat Rate Box Sizes, Prices, and How it Works [Updated with 2021 Rates]- Shippo | Shippo](https://goshippo.com/static/77272d235c2027660651d3d56f404302/Shippo-USPS-Flat-Rate-Box-Sizes-Banner@2x.png "USPS Flat Rate Box Sizes, Prices, and How it Works [Updated with 2021 Rates]- Shippo | Shippo")
USPS Flat Rate Box Sizes, Prices, and How it Works [Updated with 2021 Rates]- Shippo | Shippo
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