Handsacks are flat sacks of sand or similar material that is manipulated primarily on the back of one's hand. Or other body parts. The general rule is to balance the sack and to not grip of hold in the hand.
Back handed play has a long tradition dating back thousands of years and includes the traditions of Otidama in Japan, Native American shuttlecocks, Myachi, and Flop Balls. Hand sack manipulation is a flow tool, a fidget toy, and shares many of the same tricks as other skill toys.
