The Tupperware divided lunchbox is airtight, so no need for plastic wrap or bags. You can even put yoghurt directly into a compartment and it won't leak. Our school has a 'rubbish free' lunch box policy (pertaining to wrappers, although they also recommend no 'rubbish' food!). It's actually pretty easy when you get used to it and is much cheaper to buy things in bulk packets and put a handful in the lunchbox.

We haven't lost a lunchbox (yet!) and I have found Tupperware lasts longer than the other brands, my DD has had hers for almost 5 years with no problems. My DS dropped his and the corner of the lid broke (so not airtight anymore ) but Tupperware replaced the lid for free!