Sterilite Ultra Seal Bowl Clear Lid and Base with Red Rocket Gasket Accents. The Ultra Seal 4.7 Quart Bowl features a gasket and four latches in the lid that create an airtight and watertight seal to keep food fresh and prevent liquids from leaking. Ultra Seal bowls stack securely when in use and store efficiently when not in use. This bowl is the ideal solution for storing, transporting and serving salads, snacks and desserts. Ultra Seal containers are freezer, microwave and dishwasher safe, as well as BPA-free and phthalate-free. 0394