You can't predict the weather when planning an adventure. With Filson's Dry Roll Top Backpack, it doesn't much matter. Its exterior is crafted from polyurethane-coated 840-denier nylon, a rugged waterproof material. When combined with the roll-and-cinch closure, it can keep the interior dry even when submerged. That same closure affords a wide opening for easy loading, and an external zipper pocket and internal zipper mesh pocket keep smaller items organized. It's finished with rugged plastic hardware and high-density EVA foam on the back and shoulder straps for comfort.