I bought this cold pack after the one we had developed a leak in the seam. This one is a little bigger, and seems to be filled with the same stuff our other one had. It stays pliable when frozen, and really holds the cold, when wrapped in a towel. I put it in a pillow case so it does not directly touch my wife's knee. Works great! Time will tell whether the seams hold out on this one. The other lasted almost 5 years and too many freeze cycles to count.
Rating: [5 of 5 Stars!]