I wasn't aware these were available. They have a flat bottom so they can fit many pages in the folder. They come with a cardboard bottom to keep the bottom flat. These folders are great if you have a lot to file and want to keep it all in one hanging file folder.
I bought these so that I wouldn't have to use a lot of regular hanging files to group folders. I can fit 4 times as many folders in one hanging file and they all sit flat on the bottom so you can see the labels easily. I would have liked to get the colored ones but the extra cost couldn't be justified using grant money.
I like the 3" holding ability. They really helped us reorganize our file cabinets and hold more file folders upright so they are neater and keeps the files easier to see the tabs.
I wanted a folder that had more room than the normal ones due to all the paper I had from each month. Having the cardboard to put at the bottom allowed it to hold the paper so much better. I also loved the fact that it had the hangers to hang up. This makes it easier to use them. The box had 25 which allowed for 2 years since there is 12 months in a year and 1 extra one available. I think different colors would have make them easier to use. I would make them more noticeable if they had different colors.