Sometimes I'm at my desk at home and find that I need to cut something, and I don't always carry a folder with me when I'm sitting around the house. It occurred to me that I could have a small fixed blade at my desk for tasks like this, similar to how people have letter openers. A letter opener is usually a dull instrument and you just drop it in your pencil cup with your pencils, you wouldn't do this with a good fixed blade knife. So I was wondering how I could rig up a sheath to go in my pencil cup or attach to the side of it. I may try to mock up a few things with cardboard and tape.