Come and see our amazing products! Ultra light stretch fabrics,the hydration pack has ergonomics design on the back for maximum breathability and comfort,designed to last for years.Adjustable shoulder and chest straps,keeping the pack from bouncing while running for perfect fit.Which holds a 2L water bladder for up to 4 hours of liquid cooling. As a sports cycling rucksack,it fits various sports activities like cycling,biking,running,mountain climbing,jogging,rock-climbing and hiking.Two large independent compartments and two sides pockets for your snacks, towels, phones, and other daily stuffs, give you all the space you need to store.In addition, if you need a water bag or customized logo, please contact us. Pls confirm with us about the packing info, stock color and exact production time before placing your order