My “current” UFOs are stored in plastic boxes. The older ones are in bins and bags… I do try to keep all the important things together – all the fabric purchased for the quilt (including any binding or backing fabric), the pattern or book, any special rulers or other notions, and even thread if I picked a special thread color for piecing or quilting. That way, when I’m ready to get going on the quilt, I can just pick it up and get moving… without having to search for all the related pieces!