Why do traditional slingshots hit mud balls with big skins?

Traditional slingshots use large leather bags to hit mud balls, which is easier to control and aim. The large leather bag wraps the mud pill inside, which prevents the mud pill from being deformed or broken during the movement, ensures the stability and consistency of shooting, and provides certain elasticity, which can slow down the movement speed of the mud pill in the slingshot, thus making the mud pill easier to control and aim.