The flask designed for travel. The AeroFlask is the ideal companion for transporting carry-on liquor while traveling. The AeroFlask holds 3.4 oz (100 ml) and is designed to be the maximum container size allowed for liquids in your carry-on luggage at airports throughout the world. Aerodynamically designed, the body is inspired by the shape of an airplane wing, the AeroFlask has truly unique features like no other.