The name says it all the camelbak classic hydration pack is the quintessential bike hydration pack now updated with a cruxtrade reservoir for a faster flow of water camelbak classic hydration pack features the brand new crux delivers 20 more water per sip with an ergonomic handle for easier refilling and an onoff 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 en