The Rabitat Flip Lock bottle is made from the highest grade of plastic - Tritan. Tritan is BPA free, PVC free, and phthalates free. The Flip Lock bottle features an easy top open Flip Open mechanism which is easy to use for the kids. The bottle also features a drink meter, which encourages kids to drink water more often. The bottle has been designed for the big kids who need more fluids throughout the day and the generous 550 ML helps them stay hydrated all day. Flip Lock is leak proof and made from sturdy materials which makes it useful at school or the playground.