my product solves my problem(see my last post) because I made the measurement just enough to slide the card in easily but hard to fall out and leather causes more friction then my old pouch. and a skill I learned over this course is how to use the sowing machine because I had used it to connect two pieces of leather during the project. A important feature of my design is a pouch right outside the card pouch for money and other stuff and other than that I made a gap on one side so I can pull my card out.