This backpack is lightweight and breathable, great choice forcycling, running, marathon, hiking, climbing, and other outdoor activities. Features: Made from oxford fabric, lightweight and tear-resistant. Zippered front pocket for phones, towels, and valuables; mesh pocket for sunglasses and tools. Bladder compartment can hold a 2 liter water bladder and keep you hydrated. (Water bladder is not included) Breathable mesh back panel keeps you cool and comfortable. Adjustable chest straps and shoulder straps provide a snug fit and reduce bounce. Reflective strips increase visibility and safety at night. Suitable for cycling, running, marathon, hiking, climbing, and other outdoor activities. Specifications: Material: Oxford fabric Dimension: 26 * 5 * 40cm / 10.2 * 2.0 * 15.7in Weight: 195g / 6.9oz Package List: 1 * Cycling Hydration Backpack