The overboard waterproof dry tube bag 40l with plenty of room the 100 waterproof overboard 40 litre blue dry tube bag is the perfect gear protecting accessory for serious water sports enthusiasts sailors and group trips thanks to our easy to use fold seal systemtrade and welded seams this 40 litre dry sack is 100 waterproof and protects your gear from sand and dirt too itrsquos suitable for quick submersion and even floats on water so you can chuck it overboard without ruining