Yes. Liquid shampoo and conditioner must be 3.4 oz (100 ml) or less per bottle in your carry-on quart bag; solid shampoo bars are not liquids. Full-size bottles are fine in checked bags.
Liquid shampoo and conditioner are allowed in containers of 3.4 oz (100 ml) or less inside your one quart-size bag. Solid bars are not liquids or gels, and TSA lists bar soap as allowed in carry-ons without a size limit.
Shampoo and conditioner of any size are allowed in checked bags with no TSA restriction.
Checked against official TSA, FAA and government pages on . These are US rules unless we say otherwise; the TSA officer at the checkpoint makes the final call.
The rules in numbers
- Liquid shampoo/conditioner in carry-on: 3.4 oz (100 ml) per bottle, in your quart-size bag
- Solid shampoo/conditioner bars: not subject to the liquids rule
- Checked: no size limit
Packing tips
- Solid shampoo and conditioner bars are the simplest way to carry a full trip's supply without using quart-bag space.
- Squeeze a little air out of travel bottles before sealing; cabin pressure changes can make full bottles leak.
- Hotel-size bottles collected on earlier trips are usually under 3.4 oz and ready to reuse.
Outside the US
- UKShower gel and similar toiletries are on GOV.UK's liquids list: 100 ml per container at most UK airports, with some airports allowing up to 2 litres. Source
- EUEach liquid container must be 100 ml or less in a transparent bag of up to 1 litre; larger bottles go in checked baggage. Source
Flying somewhere else? See the rules for the UK, EU, Canada, Australia, New Zealand, Singapore and Japan.
Questions people ask
Can I bring a shampoo bar in my carry-on?
Yes. A solid bar is not a liquid, gel or paste, so it does not need to go in your quart-size bag.
What size shampoo can I take on a plane?
In a carry-on, 3.4 oz (100 ml) or smaller bottles in your quart bag; any size in checked luggage.