My handbag is super neat, military style. It's an old habit from my stoner days. I always forgot where I put stuff and I always got paranoid about losing things, so over the years, I just started putting every single item in one particular spot. And whenever I change locations, I put it all back where it belongs. And when I change handbags, I put the items in equivalent spots. That way I always find everything right away.
One of many pothead OCDs that just stuck.