Glad quart storage zipper bags are BPA-free, have a zipper closure, and may be used for a variety of storage applications. Zipper with a double seal lock: These one-quart storage bags provide a watertight seal with a rapid glide of the Yellow and Blue Make Green Seal. Glad quart zip seal bags can be used for a variety of things, including marinating meats, storing prepared foods, and organizing tiny goods. Extra-wide zip seal: Glad Food Storage Zipper Bags feature an extra-wide zip seal that locks tight and opens easily every time. Glad Food Storage Zipper Bags have an extra wide zip seal that allows you to lock and open the bag tightly.