Watershed Zip Dry Bags Westwater The Westwater waterproof backpack is ideal for portaging or hauling gear from the boat to the campsite. Keep your gear dry even when submerged! Easy-to-use ZipDry Seal presses shut like a freezer bag. 840 denier fabric with a heavy matte PU finish for abrasion resistance and overall strength. All seams are RF welded and guaranteed to be free of leaks. Padded shoulder straps with grip strips are strategically sewn in to prevent slippage.