It's a bit snug, and I think the next iteration will get a pen pocket, but it was mostly an exercise in using the quilting stitches on my new machine. I made the bias binding. Based off the free padded case pattern from the Assembly Line, https://theassemblylineshop.com/collections/gift-guide/products/free-padded-case-sewing-pattern
I considered to suggest using colored thread for the patterns but can't come up with which colors so probably it would be too much.
But don't you dare turning it inside-out! That will be a downgrade (even apart from becoming unusable)