Understanding How Many OZ Can You Bring On A Plane? is essential for smooth travel. The TSA’s 3-1-1 liquid rule allows passengers to carry liquids, gels, and aerosols in containers of 3.4 ounces (100 ml) inside a one-quart transparent bag. This guideline applies to toiletries, drinks, and other everyday items. Knowing these limits helps travelers avoid delays at airport security. Whether packing shampoo, perfume, or lotion, staying within the allowed ounces ensures a hassle-free screening experience. Learning the basics also helps you prepare better for international flights, where similar rules apply but may vary slightly by country.