How Many OZ Can You Bring On A Plane? offers a clear guideline if you're wondering how much weight you can bring on an aircraft. Liquids, gels, and aerosols may be transported in carry-on luggage in containers up to 3.4 ounces (100 ml) each. To make screening at the security checkpoint easier, all of these tiny containers must be put within a single clear bag that is about the size of a quart. This restriction applies to things like lotions, hair products, drinks, and cosmetic sprays.
The best choice for liquids weighing more than 3.4 ounces is to pack them in checked baggage since higher volumes are permitted without restriction. Certain medical liquids, baby formula, and prescription medications are examples of special exclusions that may exceed the usual limit but must be supplied individually during screening.
