These folders do have reinforced tabs but the rest of the file pockets are quite thin and would not hold up to heavy use for very long. For short-term usage they are suitable and a good value for the price.
I use these when I am filing something that I don't intend on using much. The sides are closed so constant use would be a bother. They are great sturdy and expand just enough for bulky papers. The tab is really heavy so it stands up to the filing cabinet shuffle. I also use them for projects because papers can't fall out. I don't know why some of the other reviews are calling them poor quality. It is a paper file what do they won't?