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 the USPS rules about 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:
Choose Parcel Select Ground as your service
Place a "limited quantity" sticker on the label side of your package. You can buy them here.
Common hazardous materials
Aerosols, like hair spray
Cleaning agents and solvents
Cigarette lighter fluid
Lithium ion batteries (if not installed within the device they power)
There are some products that you’re not able to ship at all, no matter what. Find out if USPS prohibits the shipment of your items.