A flask is a container typically made of glass or metal, designed to hold liquids. It often features a narrow neck and a secure lid, making it easy to carry and preventing spills. Flasks are commonly used in laboratories for storing chemicals, as well as in everyday life for carrying beverages like water or alcohol. In addition to their practical uses, flasks come in various shapes and sizes. Some are designed for specific purposes, such as the thermos flask, which keeps drinks hot or cold for extended periods. Others, like the classic hip flask, are popular for discreetly carrying spirits.