I ran out of folders and while shopping for more I found that I liked the inexpensive ([$]for 100) box better than the "better quality" ones! I can see the top portion of the papers in the files because of the undercut accross the whole top of the folder and the weight of the folder is strong enough for my files. Also I print my own labels and this gives me plenty of room!
If you are a person that has a hard time keeping up with receipts and mail buy file folders and label them and keep them in it. I bought a box of 100. I was able to share them with my family also. It is so much easier to open mail and have a file folder labeled to put stuff in.