The Camelbak Classic Hydration Pack Graphite/ Black is the quintessential bike hydration pack. This updated version comes with the new Crux reservoir for a faster flow of water. The external reservoir fill port lets you quickly top up while on the go. The Classic pack comes with a secure zippered pocket for keys & a multi tool. Features • The brand new Crux delivers 20% more water per sip, with an ergonomic handle for easier refilling, & 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.