Designed to work with the Fresh & Save vacuum pump system, this small container keeps food fresh up to five times longer than non-vacuum storage. The durable borosilicate glass container freezes leftovers without freezer burn, stores fresh produce in the refrigerator and is oven safe (without lid). To use, lock the vacuum pump (sold separately in vacuum pump set) onto the container valve and push the button to extract air, locking in flavor, aroma and nutrients.