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Our 4" label meets USPS requirements as of 2022. The 2" and 3" labels should only be used if the package is not large enough to support the 4" label. 


Shipping undeclared or improperly packaged hazardous materials (
HAZMAT) can cause serious safety consequences for postal employees, postal facilities, emergency respo

Common items like nail polish, perfume, and hair spray are considered hazardous material, and require special procedures when shipping them.

It's important to read all USPS rules regarding hazardous materials when shipping anything considered dangerous. You are liable for any failure to follow the rules. 

For common, less-hazardous items like perfume or hand sanitizer, you're simply not allowed to use air-based services like First Class Package, Priority Mail, and Priority Mail Express. This means Parcel Select Ground is your only option. You also need to follow a few steps, explained below.

How to ship hazardous materials

If you want to ship hazardous materials with USPS, you’ll need to abide by the following guidelines:

Common hazardous materials