These Heavy Duty insulation removal bags are made of 100% polypropylene fabric (3.5 oz. strength). 130% stronger than the industry standard. Guaranteed not to rip! The fabric allows the bag to breath when insulation is disposed into the expandable bag when vacuuming out from an attic. These bags use a strong polypropylene fabric and durable ploypropolene stitching. With this bag you will be able to fit approximately 75 cubic feet of insulation or 300 lbs. These bags will fit any vacuum brands that have an output diameter of less than 12 inches. Fully filled, these bags measure approximately 4’ x 6’ .