1)pyrex glass food container keep food fresh longer 2)glass body and PP lid with silicon ruber 3)air-tight and water-tight ... glass casserole, glass lid, glass bowl, glass storage set, glass container, glass ovenware, glass plate,glass dish, microwave glassware, and other ... air-tight"---Good Housekeeping *air-tight,leak-proof lid keeps food fresh,reducing waste * containers nest inside one another for ...