They're bags...they hold chalk. They come in hundreds if not thousands of sizes, styles and configurations. I'm sure there are features enough now to warrant rants and/or raves from all of you!
Go ahead and put 'em up here! Let us know why or why-not they don't suck.
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"To me, boxing is like a ballet, except there's no music, no choreography and the dancers hit each other."
--Jack Handy