We used these to move the contents of my wife's office from one city to another whenshe changed jobs recently. Best for papers/files they also work well for books except that one should not pick them up by the handles when they are that heavy.
It was a good deal and I wanted to organize my storage system. However I wish the 10 for $9.99 "Banker's Boxes" were avaialble. They were out of stock both online and at the store. What I got was 10 with an instore credit. Not really as convenient for me. Sorry