I rinsed it out, filled it, put it in my new Osprey Aether 70 and went out overnight in the Superstition Mountains. The chemical / plastic taste of the water was awful. I never had this issue before with a new hydraulics reservoir. All else is good, but if I can't get that taste out it's going straight into the garbage. I'm giving it a 1 star because it tasted that bad, and I was stuck with it for 2 days.