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![USPS Flat Rate Box Sizes, Prices, and How it Works [Updated with 2021 Rates]- Shippo](https://285902-883982-raikfcquaxqncofqfm.stackpathdns.com/wp-content/uploads/2018/03/Shippo-USPS-Flat-Rate-Box-Sizes-Square@2x.png "USPS Flat Rate Box Sizes, Prices, and How it Works [Updated with 2021 Rates]- Shippo")