The Hydro Trail 3 hydration pack from Alps Mountaineering allows you to stay hydrated, while keeping your essential gear with you. The ALPS 3 liter hydration bladder, comes complete with a bite valve for hands-free hydration. Mesh shoulder straps keep your shoulder from getting fatigued, while the sternum strap keeps the pack close to you for easy carry. The kangaroo pocket features side compression straps to give you the ability to customize the size and position of your load. The brushed polyester fabric is durable and quiet.