Amy - for a restaurant, bringing one's own container wouldn't work well. It would have to be washed by us before use, and in our case would introduce the possibility of cross contamination into our environment.
For their own leftovers, however, that is an excellent idea. And you are correct, this does require some brain retraining. Actually, I appreciate when a customer suggests we wrap that last piece of pizza in plastic or foil instead of using a box, but all too often, they request a box.
Remember 100 years ago taking leftovers would have meant bringing your own container. We have become a wasteful society.
Debra - I will have to check out those brands. I talked to quite a few vendors about green food containers at the Restaurant show at the convention center and found out that all of them had products made in China - nothing made in the US. For my customers I have to look at not only my costs, the Total Environmental Cost Of Ownership for using them, but also safety. The recent problem with milk based products tainted with Malamine is of real concern. Not only are their environmental controls lax, but also product safety. Since a lot of our customers (20%+) are wheat / gluten free and usually have other food allergies, product contamination is of concern. A corn based with a gluten or wheat binder or tainted with either wouldn't work for us.