USPS ServicesPriority Mail Flat Rate: if it fits, it ships
One price to anywhere in the US, regardless of weight. Here's when Flat Rate saves you money.
Updated 1 min read
With Flat Rate, you pay one price to send a package anywhere in the US, no matter how much it weighs (up to 70 lb). The catch: you must use the official USPS Flat Rate envelope or box, and it has to close normally without bulging.
Sizes
- Flat Rate Envelope, Legal Envelope and Padded Envelope
- Small Flat Rate Box
- Medium Flat Rate Box (top-loading and side-loading)
- Large Flat Rate Box
In Octoship, choose the Flat Rate packaging type from the Package dropdown instead of entering custom dimensions. You'll still enter weight, which is used for record-keeping.
Flat Rate boxes are free to order from USPS — see free USPS supplies.
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