A hot water bag is a convenient and fundamental heating device that serves for pain relief and keeps the body warm.
Traditional hot water bag (also known as non-electric hot water bag) is made of rubber material which is good extent of the heat-resistant and waterproof. Just fill it with hot water and use the tight stopper at the top center, to seal the container firmly. Non-electric hot water bag has had a hundred years of history, but with the progress of human civilization, electric hot water bags were appeared.
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