Our 13" x 18" 6 Mil Clearzip® Locking Top Bags are used to seal super heavy weight products that provide puncture resistance protection for industrial parts, tools and more. 6 mil Clearzip® Locking Top bags are made from low density polyethylene and can be recycled. Reclosable 13" x 18" .004 plastic bags feature impressive clarity and make storage and organization simple for industrial, food service, and medical industry applications. 13 inch by 18 inch 6 mil Zipper Locking bags meet FDA/USDA requirements for use in food packaging and storage applications.