Cách sử dụng
A flask is a small container that is used to carry liquids, especially a drink like coffee, tea or water. It can be made of glass, metal or plastic and has a lid that can be sealed to prevent spillage. Flasks are convenient to use when you are traveling, going on a hike or to the gym, or simply want to carry a drink with you. You can fill up your flask with your favorite beverage and enjoy it at your convenience.