I bought two of the large ones.  I live in an apartment complex and I am backed up to a field of green space. I have attached one by the end of my patio and unfold it out to the green space and placed one at the end of my apartment and unfold to the green space.  It allows the whole area for my two small dogs and no need for leashes.  I just fold it up on the days they mow and unfold for the rest of the week.  Love it, very easy to work with!