Using the Black Diamond Mojo Chalk Bag is super easy. First, open the cinching cord - lock closure to fill the bag with chalk. You can keep your chalk brush in the brush holder for quick use. To wear the bag, just fasten the webbing belt around your waist using the quick - release buckle. When you're done climbing, empty any remaining chalk from the bag. To clean it, use a mild detergent and gently wash the exterior. Avoid using harsh chemicals as they may damage the fleece lining. Store the bag in a dry place to prevent mold growth. And remember, the bag comes in two sizes, S/M and M/L, so choose the one that fits you best for maximum comfort.