Also do a quick google search, there are many free designs out there & maybe you could combine the best of all of them. And in this case.... yes... size does matter. When I was searching.... I walked into a 2nd hand store & found the perfect leather one for $5 so gave up on the idea of making my own. What I like about this one is it has 2 zipper pockets on the outside of the main pocket; I can carry the cords, mouse and the recharger all in there when we travel.