how many ounces for carry on

For U.S. airport security (TSA), the usual limit for liquids in a carry-on is:

• Each container must be 3.4 ounces or less (that’s 100 ml).

• All your liquid containers must fit into one clear, quart‑size resealable bag.

• You only get one such bag per person.

This applies to liquids, gels, creams, pastes, and aerosols (like shampoo, lotion, toothpaste, hair gel, and spray deodorant).

A key detail: security looks at the maximum capacity of the container , not how much is inside.
So a 4 oz bottle is not allowed in your carry-on, even if it’s half full.

There’s no fixed total ounce limit for all your liquids combined—the real limit is simply whatever can fit in that single quart-size bag while still closing properly.

Exceptions: larger amounts of medically necessary liquids and baby formula/food can be allowed, but you must declare them at security and they are screened separately.

Quick Scoop (mini guide)

Core rule (often called 3-1-1):

• 3.4 oz (100 ml) max per container.

• 1 quart-size clear bag.

• 1 bag per passenger.

Examples:

• Travel shampoo 3 oz → OK in carry-on, if in the quart bag.

• 4 oz body lotion → Not allowed in carry-on (put it in checked baggage).

• Several 3.4 oz items → OK as long as all fit in the single quart bag and it closes.

If you tell me what items you’re planning to pack (sizes and types), I can walk through what’s allowed and what should go in checked luggage.