The 3-1-1 rule for carry-on luggage. 3 ounce bottles of liquid or less; 1quart-sized, clear, plastic, zip-top bag; 1bag per passenger placed in a screening bin.
Beginning on May 26, 2008, adult passengers (18 and over) are required to show a U.S. federal or state-issued photo ID that contains name, date of birth, gender, expiration date and a tamper-resistant feature.
Luggage allowances vary by airline. Check with your carrier for the latest rules.