I've sewn up several sporrans. Not too big a leap from the hunting pouches I've made in the past. Thought about an interior pocket at one time, but decided against it thinking it would be awkward to get coins out of. Never considered using it for a credit card. Looks like a good addition. The last couple of sporrans I made, I stitched a small lanyard hook to the inside, right under where the flap joins the body. I made this addition after having to fish around for my car keys a couple of times. Now I can snap them into the clip and keep them handy.