The BuubiBottle Sip toddler straw cup is the perfect solution for parents who want to help their little ones transition from bottles to sippy cups. Each kit includes the same durable 8oz / 240ml Tritan bottle found in BuubiBottle Max, an ergonomic grip collar that gives your child the confidence to hold and sip independently, and an easy-to-clean, leak-proof 2-piece straw made from the same platinum-cured silicone as our RealFeel nipples, ensuring a safe and hygienic drinking experience.