Okay the main good ideas (for me anyway) seem to be:
  • Pencil case
  • USB drive
  • spare key
  • comb
  • chapstick tube holder
  • toothbrush

So, to my mind, the next question is how many of these can be combined?

I think a pencil/key/chapstick holder with a USB drive is pretty doable, if you put a lot of thought into it. Hmm, summer project maybe?

I'm glad I made this thread, these are some cool ideas!