NRS Tuff Sack Kayak Drybag - Tuff Sack drybags feature the innovative StormStrip system. This .35 mm vinyl closure ensures you"re getting the most waterproof bag of its kind. A heavy 1000-denier 18-oz. PVC body and 34-oz. PVC/polyester bottom combine to create a bag that will last you for years to come. They include a tie-down D-ring, and extra-heavy-duty Big-Dog quick-release buckles. The fold-down waterproof closure snaps back on itself to create a handy carry handle that will also snap around a frame or D-ring.