{"id":23263,"date":"2023-03-17T12:00:00","date_gmt":"2023-03-17T17:00:00","guid":{"rendered":"https:\/\/www.shipstation.com\/?p=23263"},"modified":"2026-10-21T16:25:26","modified_gmt":"2026-10-21T21:25:26","slug":"what-is-usps-flat-rate-and-when-should-i-use-it","status":"publish","type":"post","link":"https:\/\/www.shipstation.com\/en-ca\/blog\/what-is-usps-flat-rate-and-when-should-i-use-it\/","title":{"rendered":"USPS Flat Rate Boxes, Envelopes, and Prices"},"content":{"rendered":"\n

USPS Flat Rate boxes and envelopes let you ship up to 70 lbs via USPS Priority Mail\u00ae for one price to anywhere in the US. The appeal is simple: if it fits and the box closes normally, it ships for the same rate, no matter the weight or destination. Flat Rate can be one of the cheapest ways to ship<\/a>, but standard Priority Mail, USPS Ground Advantage\u00ae, or other services may cost less for lighter items.<\/p>\n\n\n\n

Knowing when to use Flat Rate\u2014and when not to\u2014can save you time and money on every shipment.<\/p>\n\n\n\n

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In this article<\/p>\n

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\n–<\/span>What is USPS Flat Rate<\/a>\n–<\/span>Where to get USPS Flat Rate boxes<\/a>\n–<\/span>When you can’t use USPS Priority Mail Flat Rate shipping boxes<\/a>\n<\/div>\n<\/div>\n\n
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\n–<\/span>USPS Flat Rate box prices<\/a>\n–<\/span>Cost of Priority Mail Express Flat Rate envelopes<\/a>\n–<\/span>Flat Rate vs. Standard Priority Mail: When to choose what<\/a>\n<\/div>\n<\/div>\n\n
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\n–<\/span>USPS Flat Rate international shipping<\/a>\n–<\/span>USPS Flat Rate Boxes FAQs<\/a>\n<\/div>\n<\/div>\n\n<\/div>\n<\/div>\n\n\n\n

What Is USPS Flat Rate?<\/h2>\n\n\n\n

USPS Flat Rate is a pricing model under Priority Mail\u00ae in which you pay a single flat fee to ship packages or envelopes of specific dimensions, regardless of weight (up to 70 lbs) or destination within the U.S.<\/p>\n\n\n\n

These USPS Priority Mail Flat Rate services include:<\/p>\n\n\n\n