A flask is a container used to hold liquids, often made of glass or metal. It typically has 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 laboratory use, flasks come in various designs, including the popular hip flask, which is a small, flat container designed for discreetly carrying alcoholic drinks. Flasks can also be insulated to keep beverages hot or cold, enhancing their functionality for outdoor activities.