I also use the comic boards and then I put them on end in plastic tubs. Very easy to access and see everything I have. I ruler fold anything over a yard and put on shelves. I have one bedroom with shelving on 3 walls and that is where I put the yardage/ruler folded material. I don't know anything about acid free. I'm not sure I get it. I have fabric that has been in boxes for well over 20 years and pulled some of that out this past winter and it is still just fine. I am making an effort to get rid of some of this old material and make something out of it. I doubt I'll be quilting for another 20 years as I suspect my eyesight and hands will go eventually making it impossible so I'm not worrying about the acid free.