Athletes, customers and colleagues asked for a reservoir that delivered more water per sip, with a foolproof design that made it easy to fill up and hit the trail. 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. The Crux was put through exhaustive stress tests to make sure that it won’t fail you on the trail. 100% free of BPA, BPS and BPF.