Storm Series Downstream 4LChums Downstream 4L outdoor gear bag is the ultimate storm proof pack. This piece of outdoor kit features a waterproof main pocket, to keep all your outdoor essentials dry and protected, with an easy roll top closure for easy access. The waterproof nature of this outdoor bag is made possible by the HF welded seams. This is not just a stand alone pack you need to carry either as it can be worn as a shoulder or waist pack so you can remain hands free