Ergonomic and comfortable design Hiking Backpack Water Bladder Vest Kit aligns your back while gently protecting your muscles. The ventilated mesh cover keeps your back cool by maintaining air circulation, preventing discomfort due to accumulated heat, and providing excellent air circulation and breathability. Perfect CombinationThe lightweight cycling backpack comes with an adjustable hip belt and shoulder straps that can be changed to suit your torso. The perfect size provides a great balance of moderate weight and bulk while providing a sufficient amount of water suitable for men, women. Wide range of applications This hydration pack is specially designed for road cycling, running, hiking, compact construction, small size, backlight and stability, with less wind resistance. An ideal choice for men, women. It does not move around or bounce. For cycling, hiking, running, skiing, cycling, mountaineering, hunting, racing and training. A great gift for friends and family who enjoy outdoor sports.NOTE: THIS ITEM IS NOT INTENDED FOR USE BY CHILDREN 12 AND UNDER.