9 x 12" - 4 Mil White Block Reclosable Poly Bags w/ Hang Holes. Premium Red Line bags feature a single track, heavy-duty zipper that extends the width of the bag and keeps products clean and free from moisture. Large white block area allows part numbers or other information to be written with pen directly on the bag. No labels needed! Pre-punched hang holes in the lip of these bags make them perfect for retail applications. Reclosable bags can be reused. Sizes listed are the inside usable dimensions of the bag. Bags meet FDA and USDA specifications for food contact.