Leftovers at lunch?

Can’t finish your meal at lunch? Take it to go and enjoy it later for another meal – a great way not to waste food. But,  that usually that means putting your leftovers in a polystyrene foam container that you will throw away at home. Polystyrene foam takes a very long time if ever to break down, usually cannot be recycled, and has one of the highest negative impacts on the environment.  How about bringing your own container for your leftovers? I bring a collapsible container (Tupperware and Rubbermaid both make these types of containers.)  that fits easily in my backpack and I can reuse again and again.