I have used these to organize my papers in various ways. Sometimes I will put one manufacturer's particular paper line (or collection pack) in it until I have whittled the papers down and just a sheet or two remains. I have also used it to put coordinated papers from several companies in, organizing them into a kit (or the precursor of a kit - since bulky embellishments will not fit in here.) I have at least a dozen of these - great product.
This paper file is very durable, and will hold lots of pages. It advertises that it will hold 40 sheets, but I have stuffed more than that into it. I use it to store pages by color family. Very good for organization.
The only reason I gave this 4 starts is because of space. It is limited to paper, not a paper pad (12x12). It will hold your single sheets of card stock, 12x12 or smaller, but it is a file. I use it to tuck inside the other organizer products.
Good construction, sturdy.
I use these to put paper in a staggered document stand that you can get at any office supply store, because you can see what paper you have easily. They're very sturdy and just the right size for 12x12" paper.