The TSA prohibits containers with more than 3.4 ounces of liquid in carry-on luggage, so if you have a liquid or semi-liquid antiperspirant, be sure to check the quantity on the container. For example, many stick deodorants and antiperspirants come in sizes under 3.4 ounces, so it's fine to bring in your carry-on bag.

Whether deodorant is a liquid depends entirely on its physical form. According to TSA and international "3-1-1" security rules, stick (solid) deodorant is NOT considered a liquid and can be any size in your carry-on bag without being placed in a quart-sized clear bag. However, spray, gel, roll-on, and cream deodorants are all classified as "liquids, gels, or aerosols." This means they must be in containers of 3.4 ounces (100ml) or less and must be placed inside your clear, quart-sized liquids bag. If you are trying to maximize your liquid allowance for other toiletries, switching to a solid stick deodorant is a great "hack" to save space. In 2026, security scanners are becoming more advanced, but the distinction remains: if you can pour it, squeeze it, or spray it, it's a liquid. Always double-check the label for the volume; even if a gel deodorant "looks" solid, security will treat it as a gel and may confiscate it if the container is larger than the allowed limit.