1. Nylon 2. Imported 3. Breathable and comfortable: builtin breathable mesh padding on the back for maximum breathability and heat dissipation. Made of lightweight, tearresistant nylon fabric, it is very light and durable. 4. 2 litre bladder: the hydration bladder is made of EVA material and features an extra wide screw cap with a diameter of 7 cm for easy refilling. 5. PERFECT FIT: These hydration packs are specially designed for road cycling, running and hiking. Ergonomic design on the back for maximum breathability and comfort, and chest strap and waist belt can fix the bag so that the bag does not move while driving. Wide woven shoulder straps help reduce the burden on your shoulder. Keep your body at peak performance whether you are training for a marathon or cycling. 6. Useful and simple design: adjustable shoulder straps and waist straps adapt to your needs when cycling, jogging and running. Multiple colours to choose from, suitable for men and women. And it has a helmet organizer pocket.