I made these sticks years ago to show the closed and open dimensions of the ASP baton series. The closed one is 9" and the next one is 16", and both have become sitting/indoor shillelaghs.
You see it is hard to practice with a full size shillelagh when sitting in front of a computer, yet hard (for me) to remember things like a 9 angle pattern when away from the video. A 9" stick allows me to go through the motions while sitting and watching so it is easier for my body to remember what I need to do when away from the screen. The 16" one is great for indoor training in small spaces where you risk hitting lights and things on shelves, etc. All you need is a stick long enough to get both hands on.
I follow the adage: If it is stupid but it works, it is not stupid.