Well--we start with two packs---so that is binary right from the get-go.

And then we go to inside the pack, or outside the pack (pockets, bungies, etc.)

As an FYI---we put no small things inside the pack--those all go in an outside pocket of some kind, so that we are never digging around in a large space for a small object.

And then top of pack or bottom of pack...

And it gets pretty easy at that point!