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Always do a water submersion test with a tissue or paper towel inside before use; and
Dry off the bags before opening the seals to prevent unwanted droplets from falling inside.
Simply submerge the pouch in a sink or bathtub full of water for one hour, two hours, or even overnight! Since the pouches float, you’ll need some weight to keep them underwater. A pair of dumbbells works great.
Whichever testing method you choose, the end result should be exactly the same – not a single drop of water inside the pouches.
Still a bit paranoid? You can put your phone, passport, and other high-value items in a separate zip lock bag for double protection and extra peace of mind.