I have the Bento Box, too, and I will keep it forever. One thing, though, I had to remove the plastic backing from the front and back, cuz it would lean and sometimes hit my leg with a sharp edge. With the backing removed, it's great.
Do a google search for TNI Bento Box. Get it in large.
__________________
One must live the way one thinks or end up thinking the way one has lived.
--Paul Bourget