Our 3" x 3" 4 Mil Clearzip® Locking Top Bags are used to seal heavy weight products that provide puncture resistance protection for industrial parts, tools and more. 4 mil Clearzip® Locking Top bags are made from low density polyethylene and can be recycled. Reclosable 3" x 3" .004 plastic bags feature impressive clarity and make storage and organization simple for industrial, food service, and medical industry applications. 3 inch by 3 inch 4 mil Zipper Locking bags meet FDA/USDA requirements for use in food packaging and storage applications.