Yes, you can take hairspray on a cruise in 2026, but the rules vary depending on whether you are carrying it in your "hand luggage" or "checked luggage." If you are flying to your cruise port, the TSA 3-1-1 rule applies to your carry-on: the hairspray must be in a container of 3.4 ounces (100ml) or less and fit in a quart-sized bag. However, once you reach the cruise terminal, most major lines like Royal Caribbean, Carnival, and Norwegian allow you to bring full-sized aerosol hairspray in your checked suitcase. Cruiselines do not have the same "liquid volume" restrictions as airlines; their primary concern is fire safety. While hairspray is flammable, it is considered a standard "toiletry" and is permitted. You should, however, ensure the cap is securely fastened to prevent accidental discharge, as the scent and sticky residue can damage your clothing if the nozzle is compressed during luggage handling. It is also worth noting that you should never bring a professional-grade "industrial" hairspray or large quantities of butane-powered styling tools, as these may be flagged as hazardous materials by the ship’s security scanners during the embarkation process.