We created our Knurled Welded™ Waterproof Rolltops for bike camping, adventure biking, and all weather commuting – when weight matters and getting wet is not an option. Knurled Welded™ Rolltops are made with our proprietary welding technology that combines RF welding with a mechanical interlock to create the toughest, lightest 100% waterproof bags. Each bag has a watertight rolltop closure for submersible water protection, a Hypalon® Molle loop system for expandability, and five-bar webbing haul straps for hand carrying. Go Farther. Stay Dryer. Guaranteed for Life.