CamelBak Classic Hydration Pack Racer Red and Silver In excellent condition- may have been used once Product Dimensions: 15.2 x 8.7 x 4.5 inches Crux reservoir delivers 20% more water per sip, with an ergonomic handle for easy refilling and an on/off lever 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 The name says it all: the Classic is the quintessential bike hydration pack, now updated with a Crux reservoir for a faster flow of water.