I have just finished making a pouch for a Rolls Razor blade. Depending on what part of the world you are in you may not have heard of these razors. Have a quick search on google and have a look. These razors were ingenious things because the box they came in also contained a clever mechanism to sharpen and strop them at the correct angle so you always had, well, a razor sharp blade.
Great for cutting my leather although you do have to remove the guard. The pouch was made because I wanted it close to hand but I didn't want to keep putting it back in its box.