One of the very few manufacturers to dispense with BPA & BPS as a plasticizer. The manufacturer must ensure the good reputation on ecological and toxicological acceptable levels in its products. That convinced us. That it will be many different sizes and colors available and the use in dishwasher, freezer and microwave were more buying criteria. We were not disappointed. The clever closure allows transporting in pockets without something leaking. Also we have bought over the shop BPA and BPS-Free Baby teethers are also really good.