MULTISPORT HYDRATION BACKPACK FOR RUNNING, SKIING, SNOWBOARDING, MOTORBIKE, OR BIKING. A lightweight hydration backpack supplying 4L of storage capacity to keep you running, riding, or skiing at full speed all day and night. Equipped with soft mesh highly ventilated shoulder and chest straps, built on our bounce free No Dancing Monkey™ 4-point harness system offering the best fit available in the market. No Dancing Monkey™ 1.0 Harness - Zero bounce with our patented NDM™ technology 2L Hydration system - Elite hydration bladder included.