This is the kind of instant cold pack with Ammonium Nitrate, so it's super fast acting. The 5.75x9 is bigger than the smaller ones so it gets colder longer, and it's just the thing you need when you go camping to fend off heat stroke! Bring a couple of these, wrap it around a towel and apply to the head and neck to bring core temps down! Remember to sip water not gulp when overheating!
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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