You can bring liquids on a plane in containers of 3.4 ounces (100 milliliters) or less each. All these containers must fit into one clear, resealable quart- sized (about 32 ounces) plastic bag, and each passenger is allowed only one such bag
. This is commonly known as the TSA 3-1-1 rule:
- 3.4 ounces per container
- 1 quart-sized clear bag
- 1 bag per passenger
While the total number of containers is limited by how many fit in the quart bag (usually about 7-8 containers), the total liquid volume you can carry on is roughly 25 ounces, depending on container sizes and packing
. There are exceptions for medically necessary liquids (like prescription medications, baby formula, breast milk), which can be brought in larger quantities but must be declared to TSA officers at screening
. Liquids purchased after security or duty-free liquids can also exceed the 3.4-ounce limit if they remain sealed and accompanied by a receipt
. In summary:
- Maximum container size: 3.4 ounces (100 ml)
- All containers must fit in one quart-sized clear bag
- One bag per passenger
- Exceptions exist for medical and baby-related liquids, and duty-free purchases
