I find these the right size for document storage. Not only do the documents fit but I can easily lift the box. The clear plastic makes it easy to identify the box contents.
The first file box I received had the wrong size lid. Staples was great to deal with and they the next day they sent me a replacement file box. The lid for the replacement fit fine.
Instead of cramming misc papers in my calendar I just stuff them in the differenct pockets of the folder for the month I will need to see the papers again.