I have and like these containers. Have ordered from that website with good results. They are all stainless except for a gasket - I believe silicon.

This website also has really cool stuff. They have an insulated tiffin carrier I should look into.

However - I need a lunch box. I have been trying to figure out what might work for me, and haven't come to any great conclusions. I have also been looking at the Mr. Zojirushi Bento - but that won't meet your no plastic requirement.

Curious how others organize their lunches....