The Mammut Stitch boulder bag is a medium sized chalk bag for climbing and bouldering. The Mammut Stitch gives the user the chance to be a budding designer by providing a needle and three yarns, in order for them to create their very own stitching pattern on the bag. So whether you want to imprint your name, a funky pattern or simply to tell other climbers to ‘keep off your chalk’, this is a fun idea on a quality and roomy chalk bag. There is also a handy brush compartment to keep your accessories with you.