An exploded view of the little Lock & Lock bento set -- the Korean tupperware by Hanacobi Co. You can see that the bottom right container is divided, while the bottom left container is not. The bottom two containers are 350ml each (12 oz), with a 300ml drink container/cup on top. Microwave/dishwasher/freezer- safe, and water/air-tight. Bought at Kamei in San Francisco (Bay Area bento shopping guide here). For my blog.