Be careful.... not all 8.5 x 11 file boxes from other stores work... narrower guide rails jam hanging files...no warning by Staples or other stores Don't stuff too much weight in one... over time the glue comes undone at the fold over the hanging bar.
The only thing not great about any hanging file folders I've ever noticed is that when you put them in the file drawers there is a gap at the front and back that the hanging tabs seem to love getting stuck in - if the tabs could be wide enough to not get stuck - or maybe the drawer rod that they hang on shouldn't have those notches in front or back?