The Ultra•Seal™ 4 Piece Bowl Set features a 4.7-quart and an 8.1-quart bowl, which are the perfect solutions for storing, transporting and serving salads, snacks and desserts. The smaller bowl, when assembled, fits conveniently inside of the larger bowl for efficient storage. Both bowls offer an airtight and watertight seal that is created by a gasket and four latches in the lid. Ultra•Seal™ containers are freezer, microwave and dishwasher safe, as well as BPA-free and phthalate-free.