It seems the choice is either plastic and washable ...
www.lunchboxesetc.co.uk/red-lunch-box/?gclid=CL6Pkb3ei7kCFQTMtAodfmwALw
Or the character lunch boxes, that are insulated, but get yoghurt and mushed banana in the creases!
I am tempted by the type on the first link, but would lunch be warm by lunchtime? I know I am over thinking this, but surely I am not asking too much?
Thanks