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somethin like this Hurley pack might fit your needs - at least it has some outside pockets, but I'm not sure of the lifespan of waterproof zippers  pricey at $170 for a daypack

I thought that maybe there would be something good designed for canyoneering, where you often have to swim slot canyons pushing your floating pack ahead of you - but couldn't find anything out of the ordinary - still seem to need the roll down vynil type of pack