lol they cant make that much mess,
plum tomato.
do you just have soup or do you have bread with it?
keep the soup warm in a thermos?...
you can even get bento boxes or tiffin boxes for the larger meals like chilli etc...(see pic)
they're insulated and easy to carry, nice compartments for carrying bread or rice (cauliflower of course)
Bento Box - buy at Firebox.com