The Backpack Cooler is made for hands-free adventure. Featuring a heavy-duty exterior, waterproof zipper, and up to 2 inches of closed cell foam insulation to lock in the cold this leakproof backpack floats so it can handle all your adventures, from the road to the water. Note: Some packaging may say 20 & 30 Can Backpack Coolers. Don't worry, they still fit 24 and 36 cans.