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Some of the store brands are probably not waterproof, and maybe the storage bags aren't, but I've dunked my Kindle and my Sony a few times while inside a Ziploc freezer bag and water has never gotten inside.
To test water-tightness, fill a Ziploc with water, seal it, and then shake it. If no water escapes, then no water can get in, either (unless you go deep enough for water pressure to become an issue). I dropped my Ziploced Kindle in 8 feet of water with no ill-effects. I was diving after before it reached the bottom of the pool, so it wasn't down there very long, but it was fully submerged and came out dry.
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