Many household items can’t go in the mail.
Hazardous materials come in a wide variety of forms and can be chemical, biological, radioactive, or a combination thereof.
The Postal Service's definition of a hazardous material includes many common household and consumer products. They may not be dangerous on your shelf at home, but they can become a hazard when shaken or when the temperature or pressure changes.
Fireworks, ammunition, fuses, model rocket engines, automobile air bags
Aerosols, hairspray, scuba tanks, compressed gas containers, lighters, butane, propane
Fuels (gasoline), items that contain or used to contain fuel (lighters, propane cylinders, used gasoline tanks), some paints and inks, furniture varnishes, perfumes
Toxic Materials and Infectious Substances
Insecticides, pesticides, pepper spray, infectious substances, sharps, patient specimens
Scientific instruments, products requiring a radioactive warning label
Bleach, ammonia, batteries, drain cleaners, mercury, oven cleaners
Magnets, dry ice, self-inflating lifesaving devices, lithium and lithium-ion batteries
Persons violating these law are subject to fines, imprisonment, or other severe penalties.