High Quality Material: The hot water bottle is made of high quality PVC material, which is odorless and non-toxic. BPA-free hot water bags are recyclable. Compared to the rubber clear thermos, this one is more durable and keeps the heat longer. Safe and easy to use: Open the cap first, then pour two-thirds of the 80-degree water into the rubber water bottle. Finally, screw on the lid and turn the warm water bag upside down to check for leaks. Unique design: The special pattern design on the surface makes the hot water bottle for cramps safer and more comfortable. The only cover of the hot water bottle is a comfortable, high-quality material that will keep you warm for longer. Best Helper: Heat packs can be used for hot and cold therapy. Hot compresses can relieve knee pain, back pain, menstrual cramps, and cold hands and feet. Cold compresses can relieve fever and cool down. The plush cloth cover is packaged outside the hot water bag to prevent burns and keep warm for a long time. Capacity 1000ml