Like many other reviewers, a physical therapy group introduced me to the ColPac brand ice packs. Simply put, they are superior to other brands and I have tried many through the years.The largest size is quite heavy, however, to carry from freezer to your chair or bed so beware of that if heavier objects hard for you to carry, My favorite is what they call the neck colpac which I use on my back, top of both knees at once,hip area...well and yes, my neck. Long way of suggesting if you only get one, the 21 one offers a wide diversity of uses. Good luck and quick healing!
Rating: [5 of 5 Stars!]