All Philips Avent bottles and cups are compatible excluding the glass bottles and the Grown-up cups/My First Big Kid Cups. So you can mix and match to create the perfect cup, suiting your toddler’s individual development needs. No more mess! The new patent pending valve ensures that water comes out only when the child is drinking from the spout.The Philips Avent BPA free sippy cup features a patent pending valve that guarantees no leakage. The soft non-slip handles ensure easy grip for little hands and the hard spout is bite resistant. Easy for your child, convenient for you.