A system with light-weight drinking cups that use small ball magnets embedded in the cup rim and in the bottom cup center. In a preferred embodiment, there can be four magnets at four locations around the rim and a magnet in the center of the bottom of the cup. This arrangement allows cups to be stacked easily even by very young children in a large variety of ways and configurations. The ball magnets align in an attraction mode. Hence, any two cups can be stuck together simply by bringing two of the magnets into proximity. The toy can yield large stacks with connections in many different configurations.