Description: Super lightweight backpack, constructed by water-resistant Nylon fabric, resistant to tears and abrasion. Suitable for outdoor activities like cycling, hiking, etc. Fully removable 2 liter water bladder.A great backpack for men, women and kid to stay hydrated. Easy to Carry, Slender and portable design with adjustable webbing chest and shoulder straps Utility storage, it can hold water bag, phone, helmet and etc. Great partner of running, hiking, Riding and other Outdoor sport. Specification: Item: Outdoor Hydration Backpack Material: Nylon Fabric Gender: Men/Women Size: 39x45cm Weight:About 0.28KG Application: Marathon, Running, Cycling, Hiking And Other Outdoor Sports Package Includes: 1X Bag Note: Transition: 1cm=10mm=0.39inch Please allow slightly 0-1cm difference due to manual measurement. Colors can appear different depending on light and how the listing is viewed. Thanks for your understanding and attention. Wish you a pleasant shopping experience!