Yesterday I took on the bins in the bathroom closet. Two were filled mostly with wrapping and present materials, so I started there, separating the bags from the tissue from the ribbons. And that led to the thought, "Hmm, I have more bags and tissue and ribbons in other bins under the basement stairs." So I pulled those out and separated everything: bags, tissue, ribbons, boxes, and wrapping paper. (And of course - trash, of which there was a ton.)
So once all the wrapping material was straight, I got to fixing up all the christmas boxes and other bins under the stairs. They were all messed up after I had torn out all the bulk t.p. and paper towels and diapers to put them in the new basement bathroom closet.
After I reorganized and replaced all the boxes and bins under the stairs, I found I had room for more stuff! So I went around the basement, gathered up anything that could be considered "mine" (anything not a tool, a building material, or parts) and incorporated it under the stairs.
Here is the result... And there's still room for more stuff if necessary.
And here's the closet so far - completely organized except for those few tools you see there on the third shelf. There's still more room here too - mostly in the small drawers underneath the shelves. As we demolish and re-do the upstairs bathroom, there will be more moving and re-moving of stuff too, so additional space is a good thing.