Good size, flexible. The 5" x 10" size just fits inside a gallon plastic zip type bag. You can fit in two for larger areas like your back. The gel makes them flexible for use on different areas of the body, yet they get cold enough to use to keep food or medicine cold during transport. Good size cold pack for the wrist or head, too. I use them mainly as cold packs, but I gave two to a friend with back problems, she uses them hot or cold as needed and likes the flexibility of the gel rather than as a solid piece.
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