Nalgene+me=4eva!

Do you see those aluminium drinking bottles all over the place too? I'll fess up to being mildly curious though I've been using my trusty Nalgene for well over five years.

I bogarted my roommate's (he hasn't used it), filled with agua, chilled, and have the results.

--Your hand gets cold. Metal is conducting, not insulating. Point for Nalgene.
--You can't see how much liquid you have. Point for Nalgene.
--You can't easily scrub the complete inside. I don't know about you, but I just feel better if I can coat entire surfaces with bubbles. Point for Nalgene.

That settles it. Maybe I'll die sooner from toxins, but I've accepted that fact.