For the rafters & paddlers liking side closure, we offer detachable straps that cinch down to the sides of the bag, which connect to traditional top buckles (otherwise hidden in a clever buckle garage). * For the dry bag purists wanting a traditional clip-together closure, simply expose the top quick-release buckles, roll three times and clip together in the center. * For cyclists and others wanting a quick, clean closure but don"t need cinch-down waterproof protection, the side straps clip off and the buckles hide to allow for a simple center-mounted over-the top Velcro-style strap to keep the bag closed. * AquaKnot 1200: 24" x 10" x 6", Volume 22 Lit. Capacity 1200 cu. In. Weight 2.2 lbs * AquaKnot 1800: 31" x 10" x 7", Volume 29.5 Lit. Capacity 1800 cu. In. Weight 2.6 lbs