Over a decade and still going strong!
I've had my nalgene bottle(s) over a decade now and they are still great. I think this pretty much says it all: a trackhoe (Komatsu mid-range unit, weighs about 7000kg, or 16,000 lbs)with steel tracks ran over my bottle on blacktop. I thought it was done, but to my amazement the thing survived intact. That was about 5 years ago. I have to admit: it does have some deep scratches on it from that experience. That night I took it home and shot at it with the bb gun, filled it with rocks and dropped it off the roof onto the concrete drive (it bounced), and did a bunch of other stuff to it. Then I went out and bought a second.