Yoroto non-electric hot water bag can hold up to approximately 1000 ml water and delivers a relaxing, therapeutic massage. Manufactured from the highest quality of rubber, it provides great relief from cramps and muscle or joint pain. The hot water bag, once you fill it up with hot water, stays warm for 6-7 hours and aids easy transfer of heat and warmth to the aching areas of your body and its super-deluxe size means you can use it for larger surface areas such as the upper and lower back easily. This hot water bag is leakage-proof and ensures that there is no spilling of water. Easy to fill and drain out, the manual hot bag does not require an electrical connection. It is ideal for both men and women (and extremely safe for senior citizens as well).Hot water bags can be used to treat or relieve a wide array of conditions and physical discomfort, including the:- Menstrual cramps,Pulled/tense muscles,Upper back pain,Lower back pain,Cervical pain,Shoulder pain,Elbow pain,Knee pain,Sore stomach,Headache,Cold hands and feet,Blood circulation problems,Joint pain,Arthritis