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  1. Showing 1 - 36 out of 172 results for "usps flat rate box sizes"
    1. (20)
      IDL Packaging - B-12128-5 Small Cor…
      ($7.39 / 1 ct)
      A
      Amazon.com
      delivery truckFree shipping
    2. IDL Packaging - B-1684-5 Small Corr…
      ($7.39 / 1 ct)
      A
      Amazon.com
      delivery truckFree shipping
    3. IDL Packaging Medium Corrugated S…
      ($6.30 / 1 ct)
      A
      Amazon.com
      delivery truckFree shipping
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    • Flat Rate Box Sizes | In Stock – Ships Today | Fast Delivery

    • The Official USPS® Website | USPS® Mail & Shipping Supplies

    • Stamps.com® Official Site | Online Postage

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