I love books, and I have plenty of them, approximately 1000 lbs. Moving them is tricky, you don't want big heavy boxes that have to be picked up from the floor, this will break you back. My books are organized by author, so I really don't want them all mixed up. I want them in order and easy to move.
I've found that the easiest way to move books is in grocery bags with handles. The bags can be labled with numbers to keep them in order and they are easy to pick up and carry, you just have to bend your knees a little and go.
Ok, I had 30 bags to move, but it worked very well. No broken backs, and all in order.