Waterproof Backpack Rain Wonder Cover Zip Closure Multi-Function Fits Up to 80L All Purpose, by Native Planet 210D Polyester Fits up-to 4881 cubic inches / 80L pack with zipper closure. Ideal for travel rucksacks with side access and pockets. Made out of highly durable water proof fabric - 210D Polyester, also comes with a reinforced bottom. Versatile design allows better fit for all types and brands of packs. Folds up into its own pouch, which can then be used as a stand-alone bag. Made out of waterproof, thick and highly durable 210D Polyester. Fits up-to 4881 cubic inches / 80L pack. Tough zipper closure. Has a side access and pockets, ideal for travel rucksacks. Reinforced bottom for sink-downs prevention. Versatile design allows better fit for all types and brands of packs. Folds up into its own pouch, which can then be used as a stand-alone bag. Available also in light blue for enhanced visibility in the dark and in terrain background colors.