Are you referring to real Tupperware or are you just using it as a generic term for plastic containers? When I want to take something in a plastic container, I just reuse things like Cool Whip containers, Smart Balance containers, etc. I also have some of the Rubbermaid and Dixie brands "disposable" containers as well. However, I've heard that it's not good to use these containers for microwaving, as they were not made for that. The chemicals in the plastic can cook into the food. Not good. This is why I don't use microwaves to begin with. Well, when I do it's to reheat coffee in a ceramic mug or Smart Balance for popcorn in a small Corning Ware bowl.
On the other hand, I would just tell my husband that it's a little hard to pack his lunch if there is nothing in which to put it.