A water filled hanging punching bag that measures 21 inches across and 28 inches tall, built to answer back the way a body does instead of the way a sand-packed cylinder does. Filling the shell with water rather than fibre gives the bag a moving mass, so each strike is absorbed and returned with the give of a real opponent, and the high-rebound PVC body flexes on impact instead of jarring the wrists. Filling to 70 to 80 percent of capacity is the recommended range, and staying inside it lets the bag swing and settle naturally while leaving air space that softens the shock of a hard punch. A 39 inch filling hose is supplied so water goes in and out without dismantling anything, which also makes the bag easy to drain and roll away flat when the space is needed for something else. The metal hanging chain adjusts in length, letting the bag be set at head height for combinations or dropped lower for body work, and the same adjustment suits users of different heights sharing one setup. The rounded teardrop shape suits many types of boxer and pairs with the gloves, wraps and other boxing accessories already in a kit rather than requiring a matching system. Everything needed to hang it is included and the empty bag weighs just 15.5 lbs, so it can be moved and mounted in the gym, office and outdoors as space allows.