It's supposed to take the place of a bulky wallet. The Slim Clip is designed to condense your possessions and fit into your pocket comfortably.
As it turns out, the Slim Clip will comfortably hold a drivers liscense, a few credit cards and a substantial amount of cash, and should slide in a pocket easily.
The Slim Clip infomercials also tout the product as highly durable, claiming you can run over it with a car and not cause damage. After running over the clip with a station vans- and back over it again for good measure- one dent could be seen, but the Slim Clip seemed to hold its own