@valhalla I sized it to fit an A5. It will fit an A4 too but not in close the zipper on it.
Here it is with my standard A5 spiralbound for scale.
In a decentralised social media it makes sense to host yourself. That's what we decided to do. This instance is run by two nerds, mostly for the why not of it. Feel free to join, and we'll hit you up with an "Hi, who are you?".