When we moved at work we bought a bunch of these and moved a large amount of videotapes and other items. When it came time for me to personally move I figured I would give it a try. You get 10 boxes for [$]where moving boxes can cost $3 or more each. Perfect size for moving most things they are stackable a place for marking contents and when done easy to fold up for recycling. If you want to keep for more permanent storage I recommend reinforcing the handles with packaging tape.
After being a teacher for more than 10 years I recently moved out of the classroom into a district coaching position. Instead of a hodge-podge of found boxes I opted to purchase 2 sets of these boxes. They worked great! I fit binders children's literature and of course files in the boxes. I labeled inventoried and numbered them and now 10 years of teaching is organized in 20 boxes.
Storage boxes all the same size stack neatly. When not in use boxes are kept and reused till they fall apart. Then I buy a new box of boxes to have on hand when needed. Staples Economy Storage Boxes are a staple in our house.