White Block Poly Bags White Block Reclosable Bags2 Mil - Most popular thickness used for light to medium weight products4 Mil - Heavy-duty Mil used for products like industrial hardware and tools6 Mil - Extra heavy-duty for puncture and tear resistance Minigrip® White Block Reclosable Bags2 Mil - Premium Red Line™ closure for light to medium weight products4 Mil - Premium Red Line™ zipper closure for heavier products Slide-Seal White Block Reclosable Bags3 Mil - Fast and easy slide lock glider Pre-Printed Reclosable Parts Bags4 Mil - Fast and easy slide lock glider