Camelbak hydroback hydration pack for hiking, running, and mountain biking Camelbak hydroback hydration pack good for hiking, running, and mountain biking. The included 1.5L reservoir delivers 20% more water per sip, with an ergonomic handle for easier refilling and an on/off lever that makes it easy to prevent leaks. Breathable air-mesh back panel offers a lightweight, comfortable fit. Secure zippered pocket. Lightweight, ventilated mesh harness. Reflective accents increase visibility in low-light environments.