I have 2 large totes and 2 shoe box type boxes for storage of projects, stash and scraps and I won't allow myself to collect any more than that. I store the lag totes under a daybed my husband built in my sewing room and the 2 sm totes on a bookshelf. I limit because 1) I don't want to tie up too much money in fabrics I may not like in the future and 2) We will be becoming snowbirds next year and i want to take quilting supplies with me 3) We may have to move to a smaller place when we're older.
I do have a couple rolls and some folded batting on the top shelf of my sewing room closet.