The camelbak crux lumbar reservoir delivers high flow hydration while keeping weight positioned low on your back for better stability in the saddle and on the trail 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 like all of camelbaks gear they put the crux through exhaustive stress tests to make sure that it wont fail you on the trail