From:
http://www.tsa.gov/311/311-carry-ons.shtm
"With certain exceptions for prescription and over-the-counter medicines, baby formula, breast milk, and juice, and other essential liquids, gels, and aerosols, the following rules apply to all liquids, gels, and
aerosols you want to carry through a security checkpoint.
All liquids, gels and
aerosols must be in 3.4 ounce (100ml) or smaller containers. Larger containers that are half-full or toothpaste tubes rolled up are not allowed. Each container must be 3.4 ounces (100ml) or smaller.
All liquids, gels and aerosols must be placed in a single, quart-size, zip-top, clear plastic bag. Gallon size bags or bags that are not zip-top such as fold-over sandwich bags are not allowed. Each traveler can use only one, quart-size, zip-top, clear plastic bag.
Each traveler must remove their quart-sized plastic, zip-top bag from their carry-on and place it in a bin or on the conveyor belt for X-ray screening. X-raying separately will allow TSA security officers to more easily examine the declared items."