The TSA is directly responsible for creating and enforcing carry-on luggage rules at airports, making it a major influence on factors such as luggage size, number per person and the contents that may appear inside them. It is also responsible for setting rules regarding the weight of luggage as well as regulating the liquids that travelers may carry.
All airports must comply with TSA regulations regarding travel safety and processes, including the items that travelers take with them while they fly. At the basic level, the TSA sets the rules for the maximum size and weight of carry-on luggage, which means that luggage manufacturers need to observe and match these rules provide the proper usefulness to customers. Many airports feature special signs and measurement aids that allow passengers to check that a carry-on item meets TSA regulations for overhead and under seat luggage. Similarly, it also sets the rules for exceptions for on certain types of luggage.
The TSA oversees what items passengers may place in carry-on luggage, maintaining a list of items that must be in check-in luggage as well as items that are not allowed on flights at all. The prohibited packing list includes items such as firearms, foods, explosives and tools. Liquids are also subject to TSA carry-on regulations, with rules stating that passengers may only carry a single 1-quart bag with no more than 100 milliliters of liquid per item, as of 2015.