No, solid stick deodorant does not count as a liquid under current 2026 TSA and international security guidelines. Because it is a solid, you can pack a full-sized stick of deodorant in your carry-on bag without it being subject to the "3-1-1" liquids rule (the 3.4 oz / 100 ml limit). You do not need to place it in your clear, quart-sized plastic bag. However, it is important to distinguish this from gel, roll-on, or spray deodorants, which are classified as "liquids, aerosols, or gels." These liquid-based forms must be in containers of 3.4 ounces (100 ml) or less and fit within your one clear plastic bag. If you want to maximize your liquids allowance for things like sunscreen or shampoo, switching to a solid stick is one of the most effective travel hacks to save space and avoid potential confiscation at the security checkpoint.