Stainless Steel (avoid the aluminum too). The BPA free doesn't make them last any longer, doesn't make them keep your drink cooler, doesn't make them easier to clean, etc.
Avoid the aluminum too, the reason is that aluminum has the same effect that the BPA bottles do... it leaches things into your water (however, this can be done VISIBLY if you want to see it for yourself) take an aluminum pot for example (same aluminum content that you would get in your water bottles) and use a steel wool pad on it (no soap or any other additives, just steel wool). You will see that the aluminum actually erodes into your dishwater. Now this is obviously an extreme example, but it WILL do that in a less extreme amount each time it is used... not a pretty thought.
Learned that when I was buying cookware.... but it applies to the water bottles too.
Edited by: KRYSTYL_ROSE at: 12/12/2008 (02:39)
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