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 falls under the TSA's 3-1-1 rule (3.4 oz or 100ml limit) depends entirely on its physical form. Solid stick deodorant is not considered a liquid or gel and is therefore exempt from the 3-1-1 rule; you can bring a full-sized 5 oz stick in your carry-on without any issues. However, spray, gel, liquid, or cream deodorants are strictly categorized as liquids/aerosols. These must be in containers of 3.4 ounces or less and fit inside your single quart-sized clear plastic bag. In 2026, with the rollout of new CT scanners at many airports, you may not need to remove the bag from your luggage, but the volume restrictions still apply to these specific formats. If you have a large 5 oz aerosol body spray or a large tub of cream deodorant, it must be packed in your checked luggage. To avoid any hassle at security, many frequent travelers switch to solid sticks for their carry-on kits.