I had a usb key lying on my desk for while, the casing had cracked and opened and I kept it until i found the proper replacement casing.
I hope the analog feel of it will please the film photographers on instructables :)
Step 1: The Film Cartidge
I used a reusable film cartridge i had with my bulk film loader.
I actually like the plastic film cartidge better, they are more reliable and close firmly.
As I had no use of this metal cartridge, i found it perfect for that little project.
You could of course use a standard film cartridge! Use a cheap roll if you discard the film or a roll you reuse after you developed it's film on your own ;).
I advise you open your cartridge it with a bottle opener, it's the safest way.
Step 2: Adapting the Usb Key to the Film Cartridge
i cut the film spool to hold the usb key, added some foam (maybe not the best to avoid overheating) and closed the film cartridge with the key inside.
Plug the film cartridge to your computer and voila!
You can store various files on the usb key memory, but i bet that image files will best fit ;).
I put a sticker on the cartridge and gave it as a birthday present to a photographer friend who loved it at first sight !