I actually was thinking about utilizing some fabric grocery bag if I can find one big enough for the job or maybe trying to construct something out of landscape fabric myself. It seems overwintering something in the pot outside does not work for me - drainage after soil freezes is really poor. I could find some big plastic pot and just leave it above ground, but find them unattractive. Not sure about moving peonies to garage - feel it would be more productive to keep in the ground with root bag?