The Enveloop is the only pen case I know that comes with a diagram.
The Japanese think of everything, so this cotton and leather pen case boasts regular pen pockets, short-type pen pockets and an extra pen pocket, so you don’t have to unroll the pen case to take out a pen.
Bundoki.com shipped a free Tombow Mono Zero 2.3 mm and a tiny notepad with my order. There’s the Mono Zero peeking out of a short-pen pocket.
I tucked the Parker Shadow Wave into the outside pen pocket. It looks good.
The Enveloop has other colors, but I liked this one best.