Zanknits pointed out that there has been some cause for concern with Nalgene bottles leaching BPA, which mimics estrogen. In talking with a friend who works for REI, I believe that the old Nalgene bottles are actually safe enough for adults who aren't letting water sit in them for ages (and then drinking it) or have used the bottle to hold booze (it sounds silly but lots of people, especially college students use them this way),
However, if you don't already own them, you might as well buy a Nalgene made of BPA-free plastic. They're doing a whole line now. I think it's Nalgenechoice.com or something like that. Nalgenes are good because they are dishwasher safe, don't hold tastes or odors, and, once they've been used for ages, they are recycleable.
I have a little grudge against them though because when I asked if they would be doing a swap out program for the old Nalgenes, they just said that the FDA says it's safe so I'm SOL. I replied, reminding them that they also said it was safe to prescribe thallidomide to pregnant women but Nalgene never got back to me. So I kind of want to avoid them.
If you're going for stainless steel, I would vote Kleen Kanteen. I don't remember why but I compared them and Sigg and liked them better. Maybe it was the dishwasher safeness? That's a big thing for me because I get grossed out by bacteria that could be growing in there so I like to run my water bottles through the dishwasher.
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