This hydration backpack is lightweight and water-resistant, great for cycling, camping, hiking, running, and other sports.<Br/>features:<br />durably made with anti-tear polyester fabric, water-resistant and lightweight.<Br />breathable shoulder strap and back for good ventilation and comfort.<Br />reflective strips greatly increase visibility and safety at night.<Br />adjustable chest strap and waist strap for snug fit; with a whistle for emergency use.<Br />elastic bungee cord helps store your raincoat, cycling jersey, etc.<Br />d rings for hanging small items.<Br />comes with a 2l water bladder to keep you hydrated all day long.<Br />perfect backpack for cycling, camping, hiking, traveling, and other outdoor activities.<Br/>specifications:<br />material: polyester<br />color: black / blue / green / pink (optional)<br />dimension: 28 * 8 * 43cm / 11.0 * 3.1 * 16.9In<br />weight: approx. 300G / 10.6Oz<br/>package list:<br />1 * cycling backpack<br />1 * hydration bladder