Hot Water Bag

A heating pad or hot water bag is a portable device that provides heat for warmth and pain relief. They come in two main types: a traditional bag filled with hot water or a rechargeable electric version that heats a special gel or water internally. Both are used to alleviate pain from muscle cramps, menstrual cramps, and general aches by increasing blood flow to the affected area. 

• How it works: Filled with hot water and sealed, it's placed on the body for warmth.
• Filling: Needs to be filled with hot water, typically to about two-thirds full, and tested for leaks before use.