Smartphone Case and Nalgene Bottle Koozie

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I was on the beach in Puerto Rico today with my Nalgene bottle and my iPhone and thought, "wouldn't it be convient if I had a place to put my iPhone while I was in the water and a koozie (cooler) for my water bottle?" I think yes. This would be really great to play music at the beach. The sleeve would have to be sand proof and there would have to be a layer separating the insulation from the device to prevent the perspiration from penetration.