You are allowed to bring liquids in containers of 3.4 ounces (100 milliliters) or less each in your carry-on luggage. All these containers must fit within one clear, quart-sized (approximately 32 ounces) zip-top bag, and you are limited to one such bag per passenger. This is commonly known as the TSA 3-1-1 liquids rule: 3.4 ounces per container, 1 quart-sized bag, 1 bag per passenger

. In practical terms, this means you can carry about seven or eight containers of 3.4 ounces each, totaling roughly 25 ounces of liquids in your carry-on, as long as they fit in the quart-sized bag

. Exceptions to this rule include medically necessary liquids (such as prescription medications, baby formula, breast milk), which can be carried in reasonable quantities beyond the 3.4-ounce limit but must be declared at security

. Liquids purchased after passing through security, such as duty-free items, are also exempt from this limit if they remain sealed and accompanied by a receipt

. In Europe and many other regions, the limit is similarly set at 100 milliliters (about 3.38 US fluid ounces) per container, with all containers fitting into a 1-liter clear bag

. Summary:

• Maximum container size: 3.4 ounces (100 ml)
• Total liquid volume allowed: All containers must fit in one quart-sized (approx. 32 oz) clear bag
• Number of containers: As many as fit in the bag, usually about 7-8
• Exceptions: Medications, baby food, breast milk, duty-free liquids purchased after security

This rule applies to carry-on luggage only; checked baggage has no such liquid restrictions