Hump dry waterproof rucksack coverit's simple, it's effective, it's versatile and it's waterproof a waterproof cover for your rucsac or pannier in bright and reflective materials which is highly visible from the side and the rear.elasticated edging and press stud fasteners ensure that the hump fits snugly over your rucsac or pannier bag and will not flap around. Day glo yellow and orange waterproof material with chevron pattern is bright and very noticeable by day, and the reflective tape material is clearly visible by night. There is a small mesh pocket on the outside, and the hump can be folded into this pocket for storage when not in use.can also be used to cover bike pannier bags for increased visibility.features designed to fit most backpacks between 15 35 litresfully waterproofseam sealed external zipper pocket to keep essentials to handelasticated binding and snap buckle fasteners to fit backpacks and panniersday glo fabrics for daytime visibilityreflective chevron and stripes for excellent low light visibilitymesh pocket ideal for an extra led light buy hump clothing from chain reaction cycles, the world's largest online bike store.