These cups by SIGG are Swiss designed and are a bit different from regular sippy cups. They have a totally inert inner lining that won’t leach chemicals. This is important because kid’s cups receive a lot of washing and wear and tear, thus the plastic inside degrades quite a bit.
The cups are extruded from a single piece of pure (99.5%) aluminum. The liner is a food grade, water-based resin that is sprayed and baked on to the bottle.
The liner has undergone extensive tests in Switzerland and Germany. It does not leach Bisphenol-A or other potential toxins. It contains no petroleum products, and exceeds all associated FDA requirements for food liners.
Available from Amazon.