That's a cool idea. What kind of things did you put in them? There pretty small so I couldn't imagine much more then some band-aids fitting.
We put a couple of band aids in there, along with a cotton ball, a safety pin, some string.. They gave us little packets of neosporin (they looked sort of like a small ketchup packet, but I don't know where to get them).
We also made a sewing kit out of empty tic-tac containers.