For most flights, you’re allowed to bring liquids in containers up to 3.4 ounces (100 ml) each in your carry-on, and they all have to fit in a single quart-sized clear bag (the TSA “3-1-1 rule”).

Quick Scoop: How many ounces for carry-on?

  • Maximum size per liquid container in carry-on: 3.4 fl oz / 100 ml.
  • All your liquid containers must fit together in one resealable, clear, quart-sized (about 1 liter) bag.
  • You’re allowed one such bag per passenger in most U.S. airport security lines.

So you can bring several small bottles, as long as:

  1. Each one is 3.4 oz (100 ml) or less , and
  1. They all fit comfortably into a single quart-size clear bag that can close.

A few quick nuances

  • A bottle labeled 4 oz is not allowed in carry-on, even if it’s only half full.
  • This rule applies to liquids, aerosols, gels, creams, and pastes (like shampoo, lotion, toothpaste).
  • Duty-free liquids bought after security are usually allowed in larger sizes if they’re in a sealed, tamper-evident bag.

Mini note on 2026 changes

Some airports (for example in the UK) are starting to relax the old 100 ml rule when they use newer scanners, sometimes allowing containers up to 2 liters in hand luggage.

But many places, especially U.S. airports, still follow the 3.4 oz (100 ml) in a quart bag rule , so you should assume that standard unless you’ve checked your specific departure airport’s rules.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.