1、The backpack is equipped with a built-in water bladder compartment, freeing up your hands. Riders can replenish their hydration in a timely manner while riding. 2、Made of splash-resistant nylon fabric, it is wear-resistant and tear-resistant, with a long service life. 3、The carrying structure leaves an upper and lower channel conducive to air flow, effectively reducing sweating. 4、The backpack adopts a breathable mesh design, which can quickly dissipate sweat and heat. 5、The backpack strap is enhanced with a high-visibility reflective strip, making night riding safer. Whether you're attending a rave, embarking on a hike, going for a run, or Cycle, this hydration backpack provides ample storage for all your essentials. Features: The backpack is equipped with a built-in water bladder compartment, freeing up your hands. Riders can replenish their hydration in a timely manner while riding. Made of splash-resistant nylon fabric, it is wear-resistant and tear-resistant, with a long service life. The carrying structure leaves an upper and lower channel conducive to air flow, effectively reducing sweating. The backpack adopts a breathable mesh design, which can quickly dissipate sweat and heat. The backpack strap is enhanced with a high-visibility reflective strip, making night riding safer. Specifications: Material: Nylon Capacity: 12L Size: 27*12*40cm/ 10.6*4.7*15.7in Weight: 464g/ 16.4oz Package size: 45*28*5cm/ 17.7*11*2in Package weight: 492g/ 17.4oz Package list: 1 * hydration backpack 1 * hydration backpack