The 25L Dry Cylinder Bag is a really simple product that keeps your gear dry and features a useful detachable shoulder strap. Waterproof and puncture resistant PVC tarpaulin construction. Roll down closure for a watertight seal. Rounded base improves stability meaning the bag can be stacked in tight upright spaces. Semi transparent, mesh reinforced window so you can see what's inside. Detachable shoulder strap.