As a teacher, I have a lot of bags, bags of bags if you will. However, most aren't functional. Most don't have a shape and everything ends up at the bottom. I use different bags for different days; it just depends on what I need to cart to and from school. There is one bag however that is my favorite bag. I call it my planning bag. It is from Thirty-One. It is their Organizing Utility Tote.. I love it because it holds a lot of stuff including my file crate, glasses, stapler, binder clips, and post-its. I also keep advil, hand-sanitizer and lotion in one of the pockets. The side pocket carries my pencil case with all my pens/sharpies. This bag has 7 pockets- amazing and roomy. If you are interested in one of these bags just click a picture. to take you to my Thirty-One website. I became a consultant because I LOVE these bags. They make great student teacher gifts and they can be personalized.
I'm adding a few links to desktop file organizers that would work in these bags. Mine is the Oxford Decoflex. Amason, Office Depot, Kmart and Walmart all carry them.