Mead makes a line of binder covers that might work. They've got a bunch of little pockets inside and out.

They also make a pouch that fits into a three ring binder, about 10x5 and you can stuff a lot of stuff in one.

Any of the big box office supply chains should have them, along with most of your bigger department stores. I have a number of the binder covers that I've used for years, and they've held up to some pretty interesting use.