Letters to the Editor
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Some Plastic is Carcinogenic, some may not be.
Here's a guide to the toxicity of plastic:
http://www.thegreenguide.com/doc/114/picnic
It's from May 2006, so it may be somewhat out of date. My Nalgene plastic bottle (made from untrendy white plastics, is made of high-density polyethylene, which doesn't leach. Other Nalgene bottles are made from Polycarbonate. You can use the reclycling codes as a rough guide, though "Category 7" is for miscellaneous plastics, some of which may be toxic, and some which may be nontoxic.
As for the ethics of Nalgene, Nalgene products were used in almost every laboratory I've worked in, and many of those laboratories have had nothing to do with animal research or "testing".