Our 40 x 40 3 mil flat poly bags offer medium weight protection of food, parts, hardware and more. All 40x40 3mil polybags are made from low density polyethylene and can be recycled. Our flat open top 40 x 40 .003 plastic bags feature impressive clarity and make storage and organization simple for industrial, food service and medical industry applications. These medium weight plastic lay flat 40 inch by 40 inch bags can be sealed by using twist ties, bag tape or by heat sealing, and they meet FDA requirements for use in food packaging and storage applications.