Read reviews for the waterproof Bum bag by Seacure Bags as submitted by your fellow paddlers.
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I bought one of these Seacure waterproof bags for a seriously hard trip down rough water. They are not only 100% waterproof but have the added benefit of their impact resistance so if you bash into something hard it will also protect you goodies. I had a AquaPac before but after a brush with a rock my phone got trashed!