Mammut - Boulder Chalk BagA practical chalk bag with a dustproof roll top lock system to hold everything you need when bouldering. You can store your smartphone in the zipper pocket, safely protected from dust. The mesh pocket offers enough space to hold tape, a brush and other useful items. Are you ready to move on to the next problem? Simply pick up your Boulder Chalk Bag using the practical handle. The chalk bag can be folded up for traveling to save space.