As of 2015, some prohibited items in checked baggage, as per Transportation Security Administration guidelines, fall into the categories of firearms and explosive or flammable items. Types of firearms the TSA strictly prohibits in checked luggage include flares, gun lighters and gun powder. The TSA strictly prohibits most explosive or flammable materials in checked luggage, such as aerosols, blasting caps, chlorine for spas and pools, dynamite and fire extinguishers and other compressed gas cylinders.
Firearms, BB guns, flare guns, pellet guns and other types of guns, pistols and ammunition may be brought on a plane as checked baggage if unloaded, locked inside a hard-sided container and declared to the airline at check-in. The TSA permits some explosive and flammable items as carry-on items but not within checked baggage, including lighters, electronic cigarettes and vaping devices and safety matches. Other explosive or flammable materials the TSA strictly prohibits include vehicle airbags, spray paint, torch lighters, fireworks and flammable paints.
The TSA allows many items in checked baggage in the categories of food, sharp objects, sporting goods, tools and self-defense items, as long as the traveler declares the items and meets certain regulations regarding factors such as safety and quantity. The TSA generally does not allow such items as carry-on baggage.