USPS offers packaging that can only be used when shipping with USPS. There are various types of packaging that USPS provides.
If you use a USPS service that doesn’t correspond to the postage rate selected it can cause either the package to be returned to sender or the shipment may incur a postage adjustment.
Some examples include:
- If you have a Media Mail postage label on a Regional Rate box, USPS can return this package as the correct postage was not used
- If you have a First Class Package postage label on a Priority Mail Flat Rate box a postage adjustment may be applied
USPS Priority Mail & Priority Mail Express Packaging
USPS offers Priority Mail and Priority Express Mail packaging that can be used when shipping with these specific services. These are branded as USPS mailers that are not tied to a specific rate and can only be used when shipping with USPS. The postage rates must be either Priority Mail or Priority Mail Express and are determined by the weight and destination of the package.
USPS Priority Mail Flat Rate Packaging
USPS also offers flat rate packaging that allows you to ship for a flat rate no matter where it’s going in the U.S. If it fits, you pay one flat rate! To be eligible for this postage type the specific USPS flat rate packaging must be used and the postage label must correspond. The most common types are:
- Priority Mail Flat Rate Envelope (Letter)
- Priority Mail Flat Rate Envelope (Legal)
- Priority Mail Flat Rate Padded Envelope
- Priority Mail Flat Rate Small Box
- Priority Mail Flat Rate Medium Box (top loading)
- Priority Mail Flat Rate Medium Box (side loading)
- Priority Mail Flat Rate Large Box
USPS Regional Rate Packaging
For packages traveling short distances, USPS Regional Rates are a cost effective solution. The postage rates are zone based and there are two types of Regional Rate boxes provided by USPS:
The postage label must match the Regional Rate box used.
Reference our handy guide to help you determine when to use Flat Rate or Regional Rate packaging.