Double Up Pump Pak's are great when you want to make sure that you have a test kit with you at all times or if you just need a spare pouch for money, candy etc. Splash paks are water resistant, water will bead up on the pak. They are not water proof. Splash paks, water rides are a great place for our splash pak. water resistant means that water will bead up on the outside of the case, they are not water proof due to the stitching and zippers. These are a great summer pak, lite weight and easy to keep clean. Great for water parks and rides,available in a large variety of colors. Perfect for waterproof pumps also.