Cakes on a train

[milkorplain]

My son (14) goes to a music college in London on the train once a week. I bake for the College's volunteer-run cafe, and my son takes the cakes in with him. He can't return later in his day to the cafe to reclaim my plastic boxes, so I need a way for him to carry bakes in his rucksack, and the cafe volunteers need to be able to recycle or bin the container I use.
I did find some traybake foil tins with card lids in my local 99p Store, but they have vanished. Any ideas?

Just a thought , but if you had two clearly marked containers could he pick the empty one up when he drops off the full one ?
My DD did that when she baked for a local cafe.

Thank you. I might have to go down that route. I had the same thought early on, but my son ... well he's amazing at the piano, clarinet, violin & viola but just a TINY bit less good at knowing his nether regions from his elbow. Your idea of labelling efficiently is a good one, though. The ladies and gents of the cafe might begin to link his passing smiley face with my name on those boxes. Maybe I should have changed my name when I married - then our surnames would match! I will look out for a couple of sturdy boxes that I can release on the world....

We are just post-Chritmas: do you your friends have lots of Celebrations boxes going begging? They are ideal for an 8" cake although I have been told that, in these recessionary times, they are not as tall as they used to be.

Cardboard cake boxes - you can get them on ebay?