You can bring toothpaste on an airplane with the following size restrictions:
- For carry-on luggage, toothpaste must be in a container of 3.4 ounces (100 milliliters) or less. This container must fit within a single quart-sized, clear, resealable plastic bag along with other liquids, gels, and aerosols, as per TSA's 3-1-1 liquids rule
- There is no size limit for toothpaste in checked baggage , so you can bring larger tubes in your checked luggage without restrictions, although it is advisable to ensure the tube is well sealed to prevent leaks
- Note that the size of the container-not the amount of toothpaste inside-determines whether it is allowed in carry-on bags. For example, a 5-ounce tube is not permitted even if partially used
In summary, for carry-on: toothpaste containers must be 3.4 oz (100 ml) or less and fit in a quart-sized bag; for checked baggage, larger tubes are allowed without specific size limits
