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, has storage for additional tools, gear, and safety equipment, and has a weight capacity of 50-Pound (22.7 kg). 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.