Looks like an altoids smalls tin, but also holds a USB drive...
Step 1: What you need
b) lots of duct tape
c) altoids smalls tin
d) usb drive - the typical size i.e. cruzer mini
Note: I had fully built this before I wrote the instructable, so some pictures may not fit the step. Also, in the below picture the usb isn't supposed to be inside the case already.
This is my first instructable.
Step 2: Open up the front
Slide open the tin and empty out the mints. Set the cover aside for a moment. Now look at the bottom. You see that little lip that runs along the edge? Cut just the front part of that off. Now you need to cut the hole for the drive itself. Since drives are unique, cut out a rectangle that fits the front plug of the usb. If this is confusing, look at the picture to see how it should fit.
Step 3: Attach the drive
Now you have to secure the usb in the case. The way I did this is by rolling up duct tape to pad the walls and hold the usb in place. Then just put a big piece over it all.
When taping, make sure no tape goes outside the walls of the case, otherwise you will never be able to open/close it. When done it should look like the picture.
An alternative would be to hot glue it into place.