I just started using my clip for the Wynns, and it is a normal sized clip, and I keep them in the box they came in. Just discard all the un needed cards, and it should fit snug but fine. I've actually had this pack opened since christmas and it has lasted well, with use from myself and my friend, who isn't a magician.
Definitly put them in a clip. My clip might be different because i've had it for five years or so, so I am not sure how tight or loose the newer ones are.