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I wanted to write a quick follow up to my post in November on Nalgene bottle alternatives. Recently, a Canadian retailer pulled its polycarbonate Nalgene bottles off the shelves due to concerns that these bottles may leach a harmful chemical compound called Bisphenol A (also known as BPA). This compound mimics estrogen and has been linked to an increase in breast and prostate cancers. Hard plastic bottles (such as Nalgene) are made of polycarbonate plastic, and are stamped with the number 7 at the bottom. Plastic bottles with a #7 may contain BPA. The same goes for bottles stamped with the #3 contain polyvinylchloride. If you want to err on the side of caution, avoid plastics marked with these numbers. It's important to note that Nalgene stands by its products. Here is Nalgene's response.

"Agencies and researchers worldwide have studied the safety of BPA and polycarbonate for approximately 50 years; including The Environmental Protection Agency and The Food and Drug Administration in the USA, The European Commission Scientific Committee on Food, The German Federal Institute for Risk Assessment and the Japan Ministry of Health, Labor and Welfare. Findings of studies from these agencies indicate that food and beverage containers manufactured from polycarbonate do not pose a health risk to humans. As a result, polycarbonate is used in a wide variety of consumer products including baby bottles, water bottles, dental sealants and the lining of most food & beverage containers.

Furthermore, several scientific panels including the European Union's Scientific Committee on Food, the National Toxicology Program and the Harvard Center for Risk Analysis have concluded that the weight of scientific evidence does not support the hypothesis that low doses of BPA adversely affects human health. None of the large studies conducted have substantiated the claims made by those performing some of the smaller studies frequently cited."

If you have concerns about the possible health impact of BPA plastics, check out this site which provides helpful information on "good" and "bad" plastics.