Discover this lightweight hydration vest backpack, perfect for hiking, trail running, cycling, and more. It weighs only 140 grams and has a 1.5 - liter water bladder in the main compartment. The ergonomic design aligns your back and protects muscles, while the ventilated mesh cover ensures breathability. With adjustable hip and shoulder straps, it fits both men and women. The reflective trim enhances safety at night, and the multiple pockets allow easy access to your essentials. Its compact size and low wind resistance make it ideal for various outdoor activities. Whether you're on a long - distance run or a cycling race, this backpack provides a convenient way to stay hydrated and carry your belongings. Color: Black green. Material: Polyester.