I use canning jars (like Ball) with both plastic and metal screw lids. I make my own soups and chili in big batches and put them in the jars and then freeze them. I can take them out of the freezer at home and microwave them at work. I have lots of one cup size and some odd wide mouth two cup size. They don't really stack so storage could be a problem. I have 30 to 40 and I store them in the basement in boxes. We have 6 Tupperware cereal bowls because I take cold cereal some days. We also have an assortment of plastic food containers such as cottage cheese, cream cheese, margarine etc. I choose ones that stack inside each other from the largest on the bottom to the smallest at the top. And I store the lids standing on their side inside a big margarine container so I can pick them out easily. I use them for salad, fruit, cottage cheese etc. anything I am not microwaving. I can use them a few times before I toss them in the blue bin. I replace them when I empty a new new container. I like those re-usable bags. That is the only item I don't have a real solution for. We wrap sandwiches in plastic bags or wax paper.