A hip flask is a small, portable container designed to hold liquids, typically alcoholic beverages. It is often made of stainless steel, although other materials like glass or plastic can also be used. The flask is usually slim and flat, allowing it to fit easily into a pocket or bag, making it convenient for discreet transport. Hip flasks often feature a screw-on or hinged cap to prevent spills and maintain the contents' freshness. They are popular among outdoor enthusiasts, such as hikers and campers, as well as at social events. Many people personalize their hip flasks with engravings or designs, making them unique gifts or keepsakes.