It's a cupcake holder from Dollar Tree. Cost: one buck.
You can find a whole host of different small containers to go in it, such as a snap-top sandwich container...
a veggie & dip container...
icepack-lidded containers in two sizes...
cups with lids...
smaller condiment cups with lids...
and snap-top containers in many sizes.
You can even get a cool bento-looking set of cutlery in the kids' dishes section. This matches the red of the box exactly and the fork and knife even snap together! How cool is that?
I was able to get several different combinations to fit in the box so that the lid would still go on it.
You do have to mess with the lid quite a bit to get it to go on right, but once you have all four sides clipped, it holds together quite well.
Here's a pic of my packed Mexican Bento. I couldn't find room for everything, so two containers had to ride shotgun.
Recipes and meal plans for what goes into the Dollar Tree Bento will come in later posts.