This waterproof cycling backpack with hydration insulation layer is specially designed for bike lovers and walkers. With two additional pockets on the wide waistband, you can place your phone or other valuables and take them out freely. The large capacity of 12L is spacious enough to store your needs. Nice bag for running, cycling, hiking, fishing, etc. Features: Made of tear-resistant and waterproof nylon for extreme light weight and strength. The almighty multi-pocket design is spacious enough to store your needs and keeps them comfortable. Thicken the padded back and mesh shoulder straps for maximum breathability and comfort. Built-in water bladder hanging strap (not included). Reflective strips increase visibility and safety. Fully adjustable shoulder, chest and waist strap for a custom fit. Zippered waist pockets provide some small necessities. Rope for attaching tubes on the shoulder strap makes drinking more convenient. An ideal choice for running, cycling, mountaineering, hiking, fishing, cross-country skiing and other outdoor activities. Note: Only the included bag, water bladder and other items are for demo. Specifications:Material: Nylon + Spandex + Polyester + PEVAColor: Black/White (Optional)Bag Capacity: 8 - 12 L Bag Size: 40*25*9cm/15.7*9.8