Rubbermaid Bento Storage Box with Flex Dividers, Medium, Chadwick (1789287) Open or close internal flex dividers to create custom, unique sections as you need them. Bento Toppers can act as trays, covers or lids, providing an extra layer of organization or hide whats inside. Boxes can stack vertically, or fit inside each other. The heavy-duty decorative polyester fabric coating enables it to fit into social spaces and complement your homes dcor. Made from sturdy CARB-certified MDF.