Radopolis has a big problem: water bottles. Radsters are an active bunch, but their desire to stay hydrated has led to a huge bottle pile-up. Way Cool Arena has been turned into a bottle dump, and the beloved skate park is next! The kids and Slider must find a way to get rid of the heaps of empties and reduce future waste while making sure Radsters stay healthy. Can they prevent their rad cybersite from getting bottled up? Big idea: Drinking water regularly is essential, but how you drink it is also important. Make choices that are healthy for both your body and the environment. Math concepts: Sampling and Multiplication.