This waterproof cycling backpack with hydration insulation layer is specially designed for bicycle likers and walkers. It weights only 4.9oz (140g) which make it a good for your fantastic outdoor experience. Nice bag for running, cycling, hiking, fishing, etc. Specifications: Material: Nylon Spandex Polyester Color: Light gray & orange / Dark gray & orange / Blue / Black & white / Black & yellow / Black & blue / Black & green / Light gray & blue / Light gray & dark blue / Green ( optional ) Bag Capacity: Approx. 5 L Bag Size: 35 * 18 cm / 13.8 * 7.1 in Bag Weight: 140 g / 4.9 oz Package List: 1 * Backpack