I've used them twice at the water park, riding water slides, water rafts and swimming with a fanny pack submerged for over 30 minutes each time. Water didn't get in AT ALL. You just have to make sure your hands are dry when you open it to take something out, as those few drops of water will stay there until you air them out. I had my ID, debit card, car keys, paper ID and mobile phone in my backpack and still had room. I've had so many people at the park asking if it works and where to get it. I was really impressed!
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