For high usage files I use Staples Heavy Duty Manila File Folders and for low usage or short term type files I use these thinner file folders as they are less expensive. I use these in a business setting so I use over 200 folders a year so cost is a consideration. The thinner folders take up less space in the file cabinet and are less expensive. But for high usage files it is worth it to get Staples Heavy Duty Manila Folders. If you don't use many folders each year I would go with the Heavy Duty ones.