An article in last week's Time magazine reports that the common Nalgene bottles we all know and love may actually be harmful to us.
According to the article, Nalgene bottles are made of polycarbonate, which contains the hormone BPA. Surprising amounts of BPA seep into the water, which can cause damage to reproductive systems.
Refilling bottled water bottles can also be harmful. These bottles are made of a material called polythylene, which is "not designed for repeated reuse."
So what should you use to drink? HDPE bottles (High-density polyethylene), also produced by Nalgene, or bottles made of Stainless Steel.