Monbento MB Slim black Onyx / BlackMonbento MB Slim black Onyx Black French Design. To go cutlery set new generation For an on the go lunch as comfortable as at home, choose the MB Slim Box! Its fork, knife and spoon have a long, textured handle to make them pleasant to use. Stored in its box, this reusable cutlery set will be well protected! This lunch box cutlery set can also be stored directly under the top lid of your MB Original or MB Square bento box, thanks to its removable