Tupperware Communism

An element of the culinary lifestyle of a certain demographic of social foodies, characterized by the constant exchange of reusable leftover-storage containers. Everyone has a shelf or drawer full of containers, along with matching and, often, mismatched lids, but leftovers from parties and picnics get passed around so freely that you quickly forget which ones you bought and your current set really just exists as part of the collective whole. Therefore, somewhere out there must exist the lid for that slightly-squarish, round, medium-shallow, translucent green one you've had in your closet for months.