I've been happily keeping my knitting needles in hanging file folders for many years now. Today they got a new file box.
The file box they were in was thirty years old, ugly olive green, and missing a lid. It is now in the garbage. RIP
As I was switching the needles to their new hanging files and placing them in their new file box (this one has a cover, it just doesn't show in the picture), it occurred to me that a) I've never mentioned how I file my needles b) I needed something to write about today. So when I was done, I took a picture.
All my needles are circulars or double points. I store them in the package they came in and drop them in the hanging files according to their size.
It's just enough organization so I can find what I need and it's easy to slip the needles in and out. It's not pretty, but it is super handy and practical.