Hacky sacks make pretty good projectiles when they slam into something soft like the grass or a hand... but... or the asphalt, or a park bench and they don't last long. I made my own out of leather and the innards of a broken one which lasted wonderfully until it landed in the lake. It's funny how things filled with rocks don't float very well. The woven hacky sacks work well though a little more expensive.
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