Business in the front, business in the back. I probably won't be handing out buckets of business cards, but if I happen to run out, or for those who have gone paperless, I have a QR code to my LinkedIn on the back (works at arm's length). Note that I put the whole thing in a vibratory tumbler to knock off all the shine, otherwise the QR code doesn't really work.
The front has a spring steel money clip screwed down to hold business cards. If I were to make a second prototype, I'd stay away from spring steel, both for manufacturing and use.
CAD COMING SOON