The KiloJoule is a community size chalkpot designed to be used without the fear of tipping, spilling, and wasting of loose chalk. The Patent Pending “Constant Closure System” keeps chalk from spilling while allowing for a quick and easy dip before sending your next problem. With a waterproof vinyl shell, it keeps water and moisture out while the bag is zipped up, and while it is sits on the soggy ground. A rugged YKK zipper allows this ingenious taco style closure allows for spill free transport and years of wear and tear. Take along a couple brushes and, if your shoe size allows, pack those shoes right inside for a perfect grab and go gym bag.