When is the last time you used a hot water bottle?!
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About 4 months ago, my wife is a vet and brings home baby animals from time to time and we have to put them in a cage or aquarium and put down a hot water bottle then a towel to keep them warm. We also have a disk shaped thin that looks like a think frisbee and this can be heated in the microwave and used in the same manner.
I really can't remember, I don't think they are very popular anymore as people have had accidents of the hot water leaking and burning them.