THY SANDBALL. Introducing the Sandball! If you work out with medicine balls or kettlebells you are going want to add Thy SandBall™ to your routine. Be one of the first to TRAIN HARD with the original sandball, Thy SandBall™. •Weight capacity 10-30 pounds •Load weight using the easy access, wide mouth, double closure opening •Includes No Leak inner sandbag liner that holds up to 30 pounds (sand not included) •Double set handle configuration for maximum versatility •Currently Available in Black only.