The common luggage rules for air travel cover the items allowed in checked or carry-on luggage, according to the guidelines put out by the Transportation Security Administration, or TSA. Individual air carriers adjust the weight and size in baggage rules based on the aircraft and the flight destination.
The TSA has downloadable brochures that contain the entire list of items, falling under categories such as sharp objects, sporting goods, firearms, tools and liquids. Most items on the list are prohibited in carry-on luggage, but there are exceptions for checked bags.
All items in the sharp objects category and the sporting goods category are allowed in checked bags. Skates are allowed in carry-on luggage. Certain items in the guns and firearms category, such as ammunition, BB guns, unloaded firearms and gun replicas are allowed in checked baggage. Most tools are allowed in checked bags, but wrenches, pliers and screwdrivers that are less than 7 inches long are allowed in carry-on.
The most comprehensive list of rules applies to transporting liquids. Non-flammable gels, aerosols, creams and pastes may be transported. If brought in carry-on luggage, each container must be 3.4 ounces or less, and all containers must fit into a clear, plastic one quart zip-top bag. Exceptions are made for medications, baby formula or food and breast milk, but they may require additional screening.