My ideas were a bit flawed. It was hard to sew it skinny on my machine. The outcome was bodgy job. Wonky zip and rough sewing. One tag is twisted. I had to hand sew each end of the zip where there was still open gaps because of misplanning.
In after thought I could have done the lining different so the inside zip edge was covered too. But it was a quick decision started a bit late in the evening for a decent job. Ha ha. It will hold my pens though so it will do it's job. I have one more little craft project and then I probably won't do any more until I'm on the plane to the UK.