Footbags, hacky sacks, are filled with plastic pellets, beads, cork, rubber, popcorn kernels, etc. The point is that the possibilities for filling material type are seemingly endless.

Is hacky sack good for you?

Hacky sack is a great exercise for your heart. The repetitive kicking and jumping keep your heart rate high and that aerobic rhythm is what strengthens your heart.

Can you fill a hacky sack with rice?

Fill the sack.

Pour in plastic pellets, uncooked rice, or dried lentils. If you want to use sand or birdseed, you'll need to sew it into a sock, then drop it into the crocheted hacky sack. You may need to finish filling the sack as you go.