Yes, according to easyJet and most European airport security authorities, roll-on deodorant is classified as a liquid. Any substance that is "pourable, squeezable, or spreadable"—including gels, pastes, and creams—must fit within the standard 100ml (3.4 oz) liquid restriction. Even though a roll-on feels "solid" compared to a bottle of water, the liquid inside the applicator counts toward your total allowance. You must place your roll-on deodorant inside your single, transparent, resealable plastic bag (maximum 1 liter capacity) before passing through security. If your roll-on is larger than 100ml, it will be confiscated, even if it is half-empty. To avoid this, many travelers switch to a solid stick deodorant, which is not considered a liquid and does not need to go in the clear plastic bag, saving valuable space for your other toiletries.