In a few months I'll be visiting islands in an equatorial region, some of which involve wet landings (i.e. hop out of the Zodiac into shallow surf). I'd love to find a modestly sized, not too expensive, white (ideally) and somewhat waterproof backpack in which I can carry my camera gear. I can manage without water resistance by putting everything in zip-loc bags (not preferred, but it'll work) but I'd really like a light color because of the intense sun. My camera choice is still undecided, either Mamiya 7 with 3 lenses or Nikon FM2n with two or three hand-holdable lenses.
Any suggestions?