How Big Can Liquids Be in a Carry-On Bag?

Each container up to 3.4 oz (100 ml), all in one quart-size clear bag, with exemptions for some items.

Published October 25, 2026 · 3 min read · Topic: Travel & Airline Rules · Travel rules

Typical situation

You are packing a small bag for a short flight and want to take shampoo, sunscreen and a few other toiletries without having to check a bag.

Main answer · berabags Editorial Team · Packing view

Each container in a carry-on can hold up to 3.4 ounces (100 ml), and all of them must fit in one quart-size clear bag. That is TSA’s 3-1-1 rule: 3.4 oz containers, one bag, one bag per passenger. It applies to liquids, aerosols, gels, creams and pastes.

How to pack to the rule

Decant what you need into small containers, or buy travel sizes.
Check the container, not just what is left in it. A bottle larger than 3.4 oz is too big, however little it holds.
Put everything in one clear, resealable quart-size bag that closes without strain.
Place the bag where you can reach it quickly at the checkpoint.

What is exempt

TSA lets medications, and breast milk, formula and other infant nourishment, exceed 3.4 oz in reasonable quantities. They do not have to go in the quart bag, but you should tell the officer and expect them to be screened separately. See our separate answers on these items.

What to check instead

For toiletries you do not want to decant, pack them in a checked bag if you are checking one. The FAA sets its own limits for aerosols in the hold, and the rule for hairspray differs from the carry-on rule.

Where this answer stops

This is the US rule. Other countries have their own limits and some airports have changed their equipment, so check the airport you leave from and any airport you connect through.

Sources and further reading

Three more perspectives

berabags Editorial Team · Selection view

Pick a bag with an outside pocket that is easy to reach, since the clear bag has to come out in some lanes. A small pouch with a wipe-clean lining is handy for toiletries, and a spare zip bag in the main compartment covers a leak.

berabags Editorial Team · Maintenance view

Liquids leak in the hold and in the cabin when pressure changes. Squeeze air out of soft tubes before sealing, tighten caps and put each bottle in the clear bag upright. A leak inside a fabric or leather bag can stain permanently, so put the clear bag in its own pocket.

berabags Editorial Team · Risk view

Items that look solid can count as liquids or gels, such as creams, pastes and some spreads. If you are unsure, put it in the clear bag or check it. A confiscated item at the checkpoint is a bigger loss than a few minutes of repacking.

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