I was unable to find a pannier set that works exactly as I would like for the under-seat rack on my RANS Rocket. I like the panniers made by Arkel of all the panniers I have looked at and used. However, it was impossible to find a size that worked exactly for me.
I decided to make my own set tailored (quite literally) exactly to my needs and I borrowed quite a bit from Arkel’s design work. Below is a description of the process for those who would like to do the same.