This wristlet matches my school bag, which you can see here. I've used this pattern before, but this time I've included another pocket on the back. I made up the pattern just by measuring and calculating sizes. It's just a series of rectangles. I plan on keeping it in my school bag, so that when we go somewhere directly after school, now that we are commuting together, I can tote all of my things around easily. It's not perfect, but I like it.