15 days of sea bathing, the fanny pack waist and full immersion, I can assure you that no water penetrates inside. I was able to put my car keys to the apartment, identity card, bank card and mobile phone (HTC one x), money, jewelry. (+ Do not fit either, not exaggerate .. !! The ideal is to say everything I expected from a small bag, that we forget swimming, and above for personal effects that we will not leave the beach.