Which size of bottle bands should I purchased?

The large bottle band is our biggest size. It's 57mm (unstretched) and ideal for kids to bring their water bottles to school. It's the most convenient size because it fits almost all bottles and plastic containers.

The baby bottle band is our smallest size with 55mm in diameters when unstretched (which was before called the bottle band since it was the only size available). It's best suited for baby bottles and very small bottles.