USPS Priority Mail - Free Boxes, Sizes and Flat Rate
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![All about Priority Mail Regional Rate [Updated with 2018 Rates] - Online Shipping Blog | Endicia](https://online-shipping-blog.endicia.com/wp-content/uploads/2017/09/USPS-Priority-Mail-Regional-Rate.jpg "All about Priority Mail Regional Rate [Updated with 2018 Rates] - Online Shipping Blog | Endicia")
All about Priority Mail Regional Rate [Updated with 2018 Rates] - Online Shipping Blog | Endicia
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Priority Mail Large Flat Rate Box, 12 1/4" x 12 1/4" x 6", 25/pack – ONYX Products®
Priority Mail boxes and envelopes are shrinking
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