The brand new Crux 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 for a lightweight, comfortable fit. Reflective accents for visibility in low-light environments. Secure zippered pocket for essentials. Lightweight, ventilated mesh harness. External reservoir fill lets you refill your reservoir without removing it from the pack.