We've introduced plastic bottles because there are many places where glass can't go. To read more about how we have made some of our packaging decisions, read
this article (PDF format) from The Washington Post.
Our PET bottles are fully recyclable (PETE 1), Phthalates free, don't leach, and require less energy to produce and ship. Additionally, they are not made with the chemical Bisphenol A (BPA). The same is true for our Honest Kids' drink pouches.