We just returned from our 7 day trip and loved our cool blaster. I bought it at Wal-mart for about 13 dollars and we used it instead of a misting fan. It is a bottle that holds water (we put ice in it also) and you pump it up to get pressure. We put it down in our backpack and it has a long tube with a control on it that we clipped to the outside of the backpack. When we got hot we just sprayed ourselves down with it. It also comes with a belt to hang it around your waist if you want. Well worth the money.