Chicco 2pk Duo Hybrid Baby Bottle with Invinci-Glass Inside/Plastic Outside

Bought to try these out but never had to use them as my baby liked a different brand. Purchased because these have the convenience of a lighter plastic bottle with glass. Set consists of two bottles. From information here from Chicco: DUO, the first-of-its-kind hybrid baby bottle, provides the purity of glass and convenience of plastic in one unique bottle. A breakthrough medical glass technology permanently bonds a micro-thin inner layer of INVINCI-GLASS to a premium plastic bottle, making it breakproof yet lightweight