I used these yrs ago when I could get them (worked & taught for a LQS) but they do take up more room ... I cut a lot of mine in half for smaller amts. I still have some, but I've bought the plastic organizers since. Some stores here won't give them away, friends have asked & been told No.
They also make a good travel pressing board - cover with a couple layers of cotton batting & wrap with fabric or an old pillowcase to fit. :)