The FAA strictly prohibits explosives, gases, flammable substances, toxic or infectious materials, radioactive materials, corrosives and other hazardous materials from any type of luggage. Additionally, the FAA maintains more strict restrictions on carry-on luggage, since passengers have easier access to these bags.
As a general rule, liquids, aerosols, gels and creams are allowed in carry-on bags, as long as each item is 3.4 ounces or less. For maximum efficiency during the screening process, these should be packaged in a quart-sized bag.
No form of firearm is allowed in carry-on luggage. However many forms of firearms may be transported in checked baggage. The only exceptions are flares, gun lighters and gun powder, which are prohibited in both checked and carry-on luggage.
Sharp objects are allowed in checked baggage as long as they are sheathed or properly wrapped to prevent injury. The only types of sharp objects allowed in carry-on luggage are disposable razors.
Sporting goods may also be checked as luggage but may not be taken as carry-on luggage. However, ice skates are allowed as carry-on luggage as well as checked luggage.
Tools such as axes, saws, crowbars, drills and hammers may be transported with checked baggage, but they cannot be brought on board as carry-on luggage. Screwdrivers, wrenches and pliers less than seven inches long may, however, be included in carry-on luggage.
Weapons used for self defense are allowed in checked baggage but are prohibited as carry-on luggage.
Most forms of explosives or flammable items are prohibited as both carry-on and checked baggage. Gel-type candles and small compressed gas cartridges are allowed in checked baggage, in addition to non-flammable liquids, gels or aerosols. Electric cigarettes, lighters, safety matches, small compressed gas cartridges and less than 3.4 ounces of non-flammable liquid, gel or aerosol are allowed as carry-on luggage.