Just fill a large freezer bag about half way with uncooked rice and freeze. The rice will retain the cold and make an effective ice pack when you need one to cool an injury.
Just fill the bottom of a cotton sock with uncooked rice and tie off the top. Microwave until hot. It may only take 30 seconds to 1 minute to reach your desired temperature so keep a close eye on it the first time you heat it up.
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