Yes, you can bring deodorant on a plane, but the rules vary depending on the form of the deodorant. According to TSA guidelines in 2026, solid or stick deodorants are not considered liquids and have no size restrictions; you can pack a full-sized stick in both your carry-on and checked baggage without putting it in a plastic bag. However, spray (aerosol), gel, and roll-on deodorants are classified as liquids or gels. If you bring these in your carry-on, they must be in containers of 3.4 ounces (100ml) or less and must fit inside a single, quart-sized, resealable clear bag. If you have larger containers of spray or gel deodorant, they must be packed in your checked luggage. For checked bags, there is a limit of 70 ounces (2 liters) of total aerosols per person, with no single container exceeding 18 ounces (500ml). If you have a medical condition that requires larger quantities of specialized deodorant, you can bring them in your carry-on, but you must declare them at the security checkpoint.