Very unique design, a set of size of two lunch boxes, small lunch boxes can be folded inside the large lunch box, but also through the "fixed ring" and: silica gel cover on the top of the large container. Usually, small lunch boxes fold to reduce occupied space; when food, small lunch boxes inverted, increase the storage space (not suitable for soup and so on). Food grade PP plastic / silica gel can be used in microwave oven.
