Mont Z-Force Compression SackDescription The Mont Z Force Compression Stuff Sack is an original Mont design and the first stuff sack with 2: 1 mechanical advantage to compress gear smaller with less effort. Three compression straps in pulley configuration compress your gear from both ends with a single pull of each. Pack your gear smaller than ever with less effort. The Z Force Compression Stuff Sack is made from lightweight, durable and water resistant Cordura Siliconised Nylon