Before school starts, I send a welcome letter to students and another to their families. Parents are not required to send in supplies in our district. In my letter, however, I ask them if they might be willing to send in 3 heavy cardboard folders with their child: an unfinished work folder, a writing folder, and a homework folder.
The unfinished and writing folders are stored in desks. When students are doing independent work or working on an assessment, I tell them to put "folders up". They each have an immediate private work space.
I've discovered that paper clips keep papers from flopping over and being a nuisance! I keep a few dividers in case a student has uncooperative folders!