Went back to Uwajimaya and found the 3 compartment containers I was looking for. They are little more expensive but the main section is the perfect size for doing lunch-sized donburi. For their inaugural use I tried to recreate one of my favorite meals from when I was in Japan - unagi, train station bento style with scrambled egg.
I’ve been really enjoying doing the little bit of extra cooking required to put these lunches together. I’ve been uploading pictures of what I make to flickr and tagging them - if you want to see what I’ve been making you can always see pictures of my latest lunches here.