I don't know if someone else asked this, but do you store your bags flat (I noticed some of your bags are not stuffed in the collection thread)? or stuffed with tissues? If you store them flat, does it leave fold lines or wrinkle on the bag? I store them fully stuffed with tissues because I don't want fold lines. I've been just stocking them on top of each other, but they don't get smush since they are stuffed. However they take up a lot of room (and I only have 5 bags and a canguro), so I want to look at my options.