This stuff-sack style pack is made of a revolutionary, regenerative fabric called FuseFabric. When subjected to small cuts and punctures, the unique weave of the fabric enables it to literally heal itself. Simply rub the fabric with your hands and the hole disappears. Lightweight, water-resistant, and expandable, it has a roll-top design that expands from 5 to 20-liter capacity. Carry it by the roll-up handle or over the shoulder with the removable strap.