Priority Mail® Forever Prepaid Flat Rate Medium Box – 1 – PPFRB1 | USPS.com
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Is using large flat rate box not allowed? See comment for details... : r/poshmark
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![USPS Shipping Rates by Weight Chart [2022 Full Guide] - PostScan Mail](https://www.postscanmail.com/wp-content/uploads/2022/09/USPS-Shipping-Rates-by-Weight-Chart.jpg "USPS Shipping Rates by Weight Chart [2022 Full Guide] - PostScan Mail")
USPS Shipping Rates by Weight Chart [2022 Full Guide] - PostScan Mail
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Priority Mail® Forever Prepaid Small Box – PPSFRB | USPS.com
Priority Mail® Forever Prepaid Flat Rate Medium Box – 2 – PPFRB2 | USPS.com
