These flexible ice pack systems are actually sheets of individually sealed pads that arrive flat. You can cut them to any configuration you need, soak them in water for just minutes and freeze. Voila! You now have ice packs that are not only reusable, over and over, but they are flexible when frozen. Each pack measures 3.1 " x 3.7 " and contains a special, super absorbent material that soaks up water. You receive a total of 216 packs for just $29.50. These packs are completely non-toxic. Most ice packs on the market today contain Urea, a waste byproduct. These ice packs DO NOT contain waste byproducts! In addition, these ice packs do not release the water once they thaw out. No more water in the bottom of the cooler or leakage into food or on clothing. Absolutely perfect for sporting events, sprains, bumps, bruises, headaches, and more.. When done, just throw them back in the freezer until you're ready to use them again.