So that's the proper word for the kind of lunch combinations I've lived on for years!

If you have an Ikea nearby, they have a very practical set of well-sealing plastic boxes in all sizes, something like 20 boxes for three euros. That's served me well - I just take one of the bigger boxes and put the smaller ones in at need. And they even hold liquids without spillage. Not quite a proper bento, it seems, but at times practicality beats style.