Multipurpose Device Hot water bags are great for keeping you warm, lowering stress, easing aches, and helping you sleep. In addition to keeping you warm, the hot water bag can simultaneously help you relax and get a good night’s sleep Targets Different Problem Areas From back, neck and muscle pain to joint stiffness, headaches or migraines, the hot water bag not only relaxes but also stimulates blood flow, improves circulation, and increases range of motion. Heat therapy Heat therapy is frequently used during rehabilitation, or when a person is going through deep tissue issues. Heat has relaxing properties, helping to relax stiff and sore muscles and joints