I actually managed to find a nice 3" single pocket folio at Staples which holds 43 folders nicely and is still small enough to be portable.

I just wasn't thinking outside the box enough. The mental picture I created for myself was a large filing cabinet, when in reality, these folders don't take up that much space.

As an IT Manager, I don't often have things I need to place in my tickler file, most of what I do is on demand, as machines go down, I have to fix them that day. Future reminders do happen, but it's not like I'll fill an entire 3" folio to capacity and then some.