Estimate the sphere to have a diameter of 50 cm. The volume is then (4/3) * pi * (25) ^ 3 = 65 450 cubic cm. One cubic cm of water weighs 1 gram. At one third f

Estimate the sphere to have a diameter of 50 cm. The volume is then (4/3) * pi * (25) ^ 3 = 65 450 cubic cm. One cubic cm of water weighs 1 gram. At one third full of water and clothes, the ball will weigh well over 20 kg - probably more like 30 kg if we include the weight of the plastic. Yeah, let's see YOUR kids kick that around for fun, German designer wunderkinder...