how many ounces can you bring on an airplane

You can bring liquids in containers of up to 3.4 ounces (100 milliliters) each on an airplane in your carry-on luggage. All these containers must fit inside one clear, resealable quart-sized bag, and each passenger is allowed only one such bag. This is known as the TSA 3-1-1 rule: 3.4 ounces per container, 1 quart-sized bag, 1 bag per passenger. There is no specific limit on the number of containers as long as they fit in the quart-sized bag. Exceptions to this rule include medications, baby formula, and breast milk, which can be brought in larger quantities but must be declared at security. Duty-free liquids purchased after security are also allowed in larger quantities if they are in tamper-evident bags. Checked luggage has no such size restrictions for liquids, but some hazardous liquids remain prohibited. In short, for carry-on: each liquid container cannot exceed 3.4 ounces, must fit in one quart-sized bag, and you are allowed one bag per person.