You can take shampoo on a plane in your carry-on as long as each container is no larger than 3.4 ounces or 100 milliliters, and all your liquid toiletries fit together in a single quart-size clear bag. Larger, full-size shampoo bottles are only allowed in checked luggage and are not subject to the 3.4 ounce (100 milliliter) per-container limit there.

Carry-on shampoo rules

  • Each shampoo bottle in your carry-on must be 3.4 oz / 100 ml or less.
  • All liquid, gel, or aerosol toiletries (including shampoo, conditioner, lotion, etc.) must fit in one transparent, resealable quart-size bag per traveler.
  • You can have multiple small shampoo bottles as long as they all fit in that one quart-size bag.
  • Solid shampoo bars and shampoo tablets do not count as liquids and are not subject to the 3.4 oz limit.

Simple example

If you want to know “what size shampoo can you take on a plane,” think: one person, one quart-size bag, with each shampoo bottle no bigger than 3.4 oz / 100 ml in your carry-on; anything larger goes in checked baggage.

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