comes in a variety of sizes. The link here is the size I got which is perfect for 1-3 year old. Around age 2 Maya started noticing the design pictures in her lunch box and loves them now (you can spend less to get this box without art designs). Truly doesn't leak. I've been using it multiple times a week for a year now.
The only con is that you can't microwave this bento. There are other bento-like boxes that will keep food hot or cold all day if that's what you're looking for.
I'm also very happy with these. Don't leak, that stack nicely one on top of each other and they can be microwaved. Comes in various sizes, this is my favorite side. Only warning is not to get one that has to compartments because the good spills over from one compartment into the other.