When color-coding isn't enough, SealLine See Bags take the guesswork out of what's packed inside. Made with a tough 16-oz. transparent vinyl and a heavy-duty 19-oz. black bottom, they're built to last through years of road and river miles. See Bags close with a Dry Seal roll-top closure to ensure the best watertight seal possible and have an attached D-ring for lashing tightly inside a raft or on top of a luggage rack.