For carry-on luggage, the TSA liquid rule limits passengers to carrying liquids, gels, and aerosols in containers of 3.4 ounces (100 milliliters) or less each

. All these containers must fit within one quart-sized (approximately 32 ounces) clear, resealable plastic bag per passenger

. There is no limit to the number of containers, as long as they all fit inside this single quart-sized bag

. Exceptions exist for medically necessary liquids (such as prescription medications, baby formula, and breast milk), which can be carried in larger quantities but must be declared and presented separately at security

. Liquids purchased after security (like duty-free items) are also exempt from the 3.4-ounce limit if they remain sealed with the receipt

. In summary:

• Maximum container size: 3.4 oz (100 ml) per liquid item
• Total liquids must fit in one quart-sized clear bag
• No limit on number of containers, only space in the bag matters
• Exceptions for medically necessary liquids and duty-free purchases

This is the standard rule for carry-on liquids in the U.S. and many other countries