what size liquids are allowed on a plane

In carry-on bags, liquids are usually limited to containers of 3.4 ounces (100 milliliters) or less , and all of them must fit in one clear quart- size bag. That rule applies even if the bottle is only partly full.

What that means

• Each container must be 3.4 oz / 100 ml or smaller.

• You can bring multiple small containers, as long as they fit in one quart-size bag.

• Liquids bought after security, like airport drinks or duty-free items, are generally allowed on board.

Common exceptions

• Baby formula, breast milk, and baby food are usually allowed in larger amounts.

• Medically necessary liquids, such as prescription medicines, are also exempt from the standard limit.

Checked bags

• The small-container rule is mainly for carry-on luggage. Larger liquid items can often go in checked bags, subject to airline and country rules.

Simple example

A 200 ml shampoo bottle is not allowed in carry-on, even if it is half empty, because the container itself is too large.

TL;DR: For carry-on, think 100 ml max per container, one quart-size bag, one bag per passenger.