... the curve of the wearer's hip or thigh, for comfort and discretion. Some flasks have "captive tops ... gentry. However, less compact versions had been in production for several centuries. Notably, in the Middle Ages, there ... situations where a bottle would not normally be found--for instance, in Two and a Half Men, where ... Air Force, "hip-flask" was used as code for a revolver. 6oZ Stainless Steel Hip Flask