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I definitely agree with using polycarbonate Nalegene bottles.
They're extremely durable. I've put my swiss gear to the ultimate test:
-thrown it down 3 mountains & out of a car window, and left it out in the vegas sun.
In health matters, polycarbonate bottles are the way to go with their inability to excrete plastic particles, like disc player stated below.
The best way to know if your bottle is polycarbonate is by squeezing it, if you can - it's no good.
I tried using an aluminum bottle, but it wasn't as durable (surprisingly) and couldn't stand the heat, leaving my bottle scalding.
I like the idea of having frequent players bring 5 gallon jugs, genius.
I agree that there are lots of great alternatives to disposable plastic bottles.
Here's a note on the Nalgene issue:
Since BPA was linked to cancer, Nalgene is now making BPA-free bottles which have the same features and cost the same as before ($6-7 each).