Features:Four latches and a silicone gasket create an airtight and watertight seal, keeping food fresh and preventing liquids from spilling. Color-coded accents clearly identify which lid belongs to its matching base. Containers with the same color accent can stack and nest inside one another for efficient use of space in the refrigerator or cabinet. This exclusive 36 piece set offers an assortment of convenient sizes. All ultra seal food storage items are bpa and phthalate-free.