Petzl Bandi Chalk Bag The reinforced rim maintains the shape of the bag. The wide, round shape and supple fabric allows for easy access to chalk and is comfortable to use Patented Petzl emergency whistle integrated into the cordlock closure Elastic brush holder for cleaning holds Double loops for stability allow easy attachment to a belt or carabiner Fleece lining distributes the chalk evenly and an internal gutter helps prevent accidental spills