As someone who takes her lunch to work every day in a plastic container, I'm always on the lookout for new and better options. I occasionally use this one, which fits nicely in my bag but is also plastic, and only good for carting certain types of food. Thankfully, Lorena Sinclaire seems to have gone ahead and designed a perfect, beautiful alternative with the Tiffin Lunch Kit.
Tiffin Lunch Kit is made from two ceramic bowls - one square, one circular - that stack together and seal with a cork lid, which doubles as a plate. Like I said, pretty much perfect.