Contents of carry-on bags are subject to certain regulations. As of 2010, a traveler must put toiletries in containers of 3.4 ounces or less, and fit them all into one clear, quart-size, 7.5" x 8" plastic zip-top bag. Exclusions to these restrictions include baby milk/formula and medically necessary liquids.
U.S. domestic flights require passengers 18 and older to have proper identification along with their tickets. Acceptable identification includes government-issued IDs such as passports, driver's licenses and military IDs.
Travelers may bring approved electronic devices such as laptops, MP3 players and portable video games through the screening point. Such devices can be used on the airplane, but only as the airline permits. For example, passengers can't use electronic devices during takeoff and landing.
The TSA website provides a list of prohibited items at http://www.tsa.gov/travelers/airtravel/prohibited/permitted-prohibited-items.shtm. Some items, such as sharp knives, baseball bats and hammers, are not permitted in carry-on luggage but can be put in checked luggage.
Some countries and states prohibit travelers from bringing in certain items, such as alcohol, fruit or plants. Individual airlines also have separate safety policies and restrictions from the TSA rules. Check with the airline and destination to determine whether an unusual or special item is permissible.
