The Klein Tools Tradesman Pro™ Ironworker and Welder Backpack's exterior is made of flame resistant 1680d ballistic weave and leatherette materials for durability. This 27 pocket tool bag fits a 24-Inch to 36-Inch connecting bar, welding helmet and hard hat and has storage for additional tools, gear and safety equipment. This tough backpack with fully molded bottom, aircraft cable reinforced handle, and hard front pocket was designed with the professional ironworker and welder in mind.