Most domestic airlines have adopted a common set of standards for carry-on luggage. In most cases, travelers are limited to a single carry-on bag in addition to a personal item such as a purse or briefcase. The maximum size (length x width x height) cannot exceed 45 inches and must fit in the overhead bin.
Although checked luggage fees can vary among airlines, size and weight restrictions are similar. On average, checked luggage cannot weigh more than 50 pounds with a combined length, width and height of 62 inches or less.
Heightened security concerns prompted the Transportation Security Administration (TSA) to implement a set of rules regarding liquids, commonly referred to as the "3-1-1" rule. This rule limits the size of liquid containers to 3.4 ounces, packed in a one-quart plastic bag. Each traveler is allow one bag.
While the TSA limits the type of items packed in carry-on luggage, some unusual items are allowed in checked luggage. Examples include firearms, spear guns, swords, meat cleavers and stun guns.
