Cut a strip to the correct width to fit the flash (e.g. Transcend Ultra-Slim Metallic Flash Drive
) drive between two stitches. I used a racing bicycle tube, because it had the perfect width to begin with.
Put the flash drive between the stitches and cut a slot, through one of the layers (as shown in the third picture). All that is left to do is to add an press fastener and you are good to go.