Our 4" x 6" 4 Mil white block poly bags offer heavy weight protection with a white block area that accepts rubber stamp, marker, grease pen, or ballpoint pen for organizing your storage items. All 4x6 4mil whiteblock polybags are made from low density polyethylene and can be recycled. Our whiteblock 4" x 6" .004 plastic bags feature impressive clarity and make storage and organization simple for industrial, food service and medical industry applications. These heavy weight flat white block 4 inch by 6 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.