Thermos, an awesome and classic brand that started over 110 years ago, offers various stainless steel insulated drinking vessels. Their products are made very sturdy and the design is simple and practical, including their infant line. We wanted a drinking vessel that was not primarily made out of plastic, that she could hold and drink from easily herself, and could be taken in a bag without spilling. Our daughter loves the Foogo Vacuum Insulated Straw Bottle.