Naturehike 15L Outdoor Cycling Bag with Helmet Net, Lightweight and Breathable Mesh Design, Suitable for Riding, Travel and Other Outdoor Activities Material: 5% chinlon , 95% nylon Ventilate shoulder girdle: Slim design, docile, breathable, one-piece back breathable net pad for ventilation Size (LxWxH): 50x33x18 Capacity: 15L; Small front pocket is very practical, suitable for storing small articles such as your mobile phone Waterproof nylon fabric prevents liquid from entering Lightweight straps design, enhances comfort <span class="a-text-bold">Main pocket</span> is large enough to carry what you need. <span class="a-text-bold">Outer pocket</span> is great for quick access. <span class="a-text-bold">Inner pocket </span>which doubles as the storage pouch is perfect place for valuables belongings. <span class="a-text-bold">Two large side mesh pockets</span> for guide books, water bottle or umbrella. Weight: 0.26 lbs-18L; 0.38 lbs-25L Capacity: 18L/ 25L Compact Size: 4.7x2.7 inches-18L; 7x 3.1 inches-25L Unfold size:16.5x9.1x6.7 inches-18L;18.9x10.2x7.5 inches-25L 1 x Naturehike 18L or 25L Packable Backpack 1 x Attached carry bag