Single Zipper and white write-on block standard for sandwich size Double zipper and white write-on block standard for quart, gallon and jumbo storage and freezer bags Double zipper feature provides greater leak-resistance Large offset lip with external grip ridges allow easy handling, even with gloves Packed in crush resistant dispenser cartons that offer protection in toughest environments Cold-fracture resistance for short freezing and heavy duty freezer grade FDA approved for contact with food Available in different thickness and sizes