You are allowed to bring liquids, aerosols, gels, creams, and pastes in containers of 3.4 ounces (100 milliliters) or less each in your carry-on luggage when flying. All these containers must fit comfortably within a single clear, quart-sized (approximately 32 ounces) resealable bag. Only one such bag is permitted per passenger
. In practical terms, this means you can carry about seven or eight containers of 3.4 ounces each, totaling roughly 25 to 27 fluid ounces, depending on the size and shape of the bottles and how well they fit in the quart-sized bag
. Exceptions to this rule include medically necessary liquids, baby formula, breast milk, and other items required during the flight or at the destination, which can exceed the 3.4-ounce limit but should be declared to TSA officers at the security checkpoint
. This 3-1-1 rule (3.4 ounces, 1 quart-sized bag, 1 bag per passenger) is a standard security measure in the U.S. and many other countries, including Europe, where the limit is similarly set at 100 ml (about 3.38 ounces) per container
. Any liquids exceeding these limits must be packed in checked baggage or will be confiscated at security
