Reddit mentions of Case-it Open Tab Velcro Closure 2-Inch Binder with Tab File, Purple, S-816-PUR

My first solution for just playing D&D was this storage clipboard from Office Depot. The storage is just the right size for a PHB plus a few sheets of paper, a couple of pencils on the bottom, and one set of dice in the corner storage.

When I started playing other games and wanted to carry things to run games myself in one package I got a combination file-folder and binder. I can't find the specific model or brand I got, but something like this to be an RPG kit. It ended up being overkill as I don't need the binder rings when all my sheets go into the file folder, but my dice and extra pencils go in the pocket in front of the file folder (the one I have has several small mesh pockets instead of one big one). If you frequently take notes on scratch paper, or have your character sheets in plastic binder inserts so you can write over them in dry-erase, the binder part will be more useful.

Alternatively, if you don't need the file-folder to hold a lot of loose sheets, you could get a regular binder with pockets for your character sheets and some mesh pockets to hold components (this was my plan before I saw the combination binders).

I have a bookshelf next to my desk dedicated just to embroidery stuff. For floss I just use 6 of those plastic thread organizer boxes. I keep a long pencil tray, like this, where I keep random odds and ends that I want within easy reach (like needles, scissors, Fray Check, etc.). Fabric (whether flat or in a long tube) get stacked neatly on another shelf. I also keep a small bucket of scrap fabric there, which comes in handy when I want to test a new stitch or see how colors look together or something. Another shelf near the bottom holds rarely used supplies. And I have a magazine holder like this for patterns.

As for WIP and finished pieces, they go in this large binder. WIP go in the rainbow accordion file in the front (the fabric & pattern) - one per divider. I put finished projects in a clear plastic sheet protector on the rings. It's fun flipping through seeing everything I've done, and it's nice having most of them in one place to show other people. Large projects that don't fit in the binder when finished are usually gifts or one of the few things I put on display.

I use this organizer to store the thread colors of current WIPs so I don't have to put them back in the main storage every single time I stitch (plus small scissors and needles), and it is also quite convenient to slip in a bag or purse if I want to bring a project with me.