Right size for files in folders. Bought it because the sides are straight to stack and store better. Seems ok for that. I won't know for a long time how sturdy it is in the attic.
The plastic file organizers we purchased work great and are high quality. Their stackable and quite sturdy. Much better that my old paper file boxes. We found them cheaper on line (with Staple's) and the store matched the price. My only minor complaint - why do manufacturers apply stickers that are difficult to remove???
Didn't need hanging folder for this file box to organize papers we are keeping for an estate. Holds everything neatly nice and sturdy and the handles make it easy to transport.