Stainless steel design looks great and allows you to avoid potentially harmful BPA exposure from polycarbonate bottles. Thermal double wall design for both hot and cold liquids. 20 oz. (Red)
From Science Daily:
"When it comes to Bisphenol A (BPA) exposure from polycarbonate plastic bottles, it's not whether the container is new or old but the liquid's temperature that has the most impact on how much BPA is released, according to University of Cincinnati (UC) scientists."