This is from the reusablebags.com site :
Healthy & Safe
SIGG reusable bottles exceed FDA requirements and have been independently tested to prove 0.0% leaching, helping reduce your exposure to harmful chemicals like BPA (see Newsroom for more). The proprietary SIGG bottle lining is a water-based, non-toxic coating that is baked into the interior walls and remains flexible and crack resistant for the life of the bottle. The special SIGG lining is not plastic – it is a micro-thin epoxy. Due to the finish of the liner, there is much less chance for bacteria build-up with a SIGG as opposed to plastic containers. The liner is taste-neutral and resistant to fruit acids and energy drinks, ensuring that your drinks taste like your drinks every time.