Check the listing for details. Mammut Boulder Cube Chalk Bag Marine - New. Condition: New. Listed at 29.50 USD. The Mammut Boulder Cube Chalk Bag is a durable chalk bag for bouldering. When you've got lots of friends, you're going to need lots of chalk. Gather the group and head out to the next bouldering problem with this strap-equipped chalk bag by your side. It's durable, sturdy, and features a drawstring top to prevent chalk loss. A zippered pocket for your phone and keys, another for brushes or other small items. Chalk up, it's time to climb.FEATURES OF THE MAMMUT BOULDER CUBE CHALK BAGWide and stable base keeps the chalk bag uprightLarge dust-protected zipper compartment for a smartphone with key holderLarge compartment for brushes and useful itemsPractical carrying loop for easy transport to the next problemPFC-freeHigh-quality fleece lining for reduced dust and even distribution of chalk in the handSelling Point Hartware 1049Outer material and closure made from recycled polyester