You can't go wrong with this. When I was in college, my roommate and I decided to test the structural integrity of a Nalgene. We were, for reasons which I cannot fully reconstruct, irritated at the structural perfection of the thing. Didn't matter what one did to it, it would not break. We were tired of having our flaws and inadequacies sneered at by this inanimate plastic thing, so perfect at it's job, so faithful, so unpossessed of anything even approaching a flaw. Nothing, we reasoned, has any business being perfect. So, we chucked my full Nalgene out of a third-floor window. It landed on concrete with a terrific SMACK!, which startled the hell out of this annoying girl who just happened to be standing close by, and bounced about five feet in the air before coming to rest, entirely unscathed. People seemed shocked, but we were not even a bit surprised. This thing is so solid, it's really kind of incredible. Like Chase Utley, the Godfather, the Hope diamond, Abbey Road, the chicken nugget, I cannot imagine an improvement. It's just so... perfect. If you're not totally thrilled with one of these, I don't know what to tell you. It's just that good.