I chopped up many of my 12" papers, but the remaining stash (still too much) are in these:
https://www.amcplastics.com/AMC-Plas...pbooking-Pages
I've had them in hanging folders on a rolling cart and just lined up on a shelf, depending on the arrangement of the rest of the room (like when I've used the cart for my serger). I can't get the link for the cart to work, but it's on Amazon as "Advantus FS2BHD" and also as a Cropper Hopper rolling cart. They are exactly the same (both made by Advantus), but the "not crafty" one is about six dollars cheaper. I've attached a thumbnail of what it looks like.