You can bring liquids, aerosols, and gels in containers of 3.4 ounces (100 milliliters) or less each in your carry-on luggage. All these containers must fit within one clear, resealable quart-size (about 32 ounces) bag , and you are allowed only one such bag per passenger. This is known as the TSA's "3-1-1 rule" (3.4 oz containers, 1 quart bag, 1 bag per passenger)

. In practical terms, you can carry roughly seven or eight 3.4-ounce containers , depending on their shape and how well they fit into the quart- sized bag, totaling about 25 liquid ounces

. Exceptions to this rule include medically necessary liquids (like prescription medications, baby formula, breast milk), which can be carried in larger quantities but must be declared to TSA officers at the checkpoint

. Liquids purchased after passing through security or duty-free liquids bought internationally in sealed packaging with a receipt are also exempt from the 3-1-1 restrictions

. Any liquids exceeding 3.4 ounces must be packed in checked baggage to avoid confiscation at security