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Probably a dumb question, but I want to be sure since the documents I'm sending out is super important. What difference besides the size do these two envelopes have? They're both the
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![USPS Shipping Rates by Weight Chart [2024 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 [2024 Full Guide] - PostScan Mail")
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Priority Mail Express Box 15 5/8" x 12 7/16" x 3 1/8" – Stamps.com Supplies Store
