No, you cannot take a 150ml deodorant in your carry-on bag in 2026, as it exceeds the universal 100ml (3.4 oz) limit for liquids, aerosols, and gels. This rule applies to sprays, roll-ons, and even gel-based stick deodorants. Even if the 150ml container is nearly empty, it will be confiscated by security because the rule is based on the container's capacity, not the amount of product inside. The only exception is if your deodorant is a solid stick, which is not classified as a liquid and can be any size. For 150ml spray or gel deodorants, you must either pack them in your checked luggage or purchase a travel-sized version for your cabin bag. Note that at some UK airports, new scanners are being trialed that may allow up to 2 liters of liquid, but until this is global, the 100ml rule remains the safest standard.