

Typically, it’s crucial that you pay for the specific service marked on your USPS box or envelope. It’s Perfectly Fine to Change Flat Rate Packaging to Ship Weight-Based Priority MailĬontrary to popular belief, you can technically alter your flat rate packaging to qualify for weight-based rates.

The same goes for Priority Mail Express flat-rate envelopes! If you put something in a Priority Mail Express flat rate envelope and try to ship it First Class Package, guess what? USPS will charge you for Priority Mail flat rate postage.įor more information, check out our guide on paying for the service marked on your USPS-branded boxes or envelopes.

You won’t be able to ship regularly Priority Mail, Priority Mail Express, or Parcel Select Ground in that box. For example, if you have a Priority Mail Medium Flat Rate Box, that’s the service you need to pay for. In the majority of cases, USPS is very strict about paying for the exact shipping service that’s marked on your box or envelope. You Need to Pay for Flat Rate Postage If You Want to Use Flat Rate Boxes (Most of the Time) Where Can I Get Flat Rate Boxes or Envelopes?įirst thing’s first: if you’re in the market for some USPS flat rate boxes or envelopes, you can pick them up for free at your local Post Office. You can also order them on the Postal Service’s website, if you don’t feel like making the trek (hey, we don’t blame you).
