Hey all, what do you keep your registration in while you are in the boat? The "pocket card" portion that is supposed to be on you at all times. I don't want another thing to carry in my wallet and it needs to be waterproof anyway. Growing up I know grandad always had a cylinder with a cone top that hung from a small chain attached to the motor, but I would like something a little more substantial for lack of a better word. What do you guys do?