I had been sorting by title and issue number. But, as I'm actively collecting Silver Age Action Comics and Superman as well as the current issues, it is a hassle to shift everything. I've recently started pulling all Superman related comics into separate boxes. That should, hopefully, reduce the amount of shifting that needs to happen. I also agree on the comments about mylar, I'm slowly replacing all may bags with mylar, as well as making sure the boards are true acid free.