I bought two sets of these rust proof goldtone expens that have a 32 ft. area. ($29.99 each) We take these things everwhere we go when traveling. They are a life saver. When we pic-nic, the dogs have their own run, and we just attach a water bottle to the pen. I also have a solar canopy that I put over it when there is too much sun. I got the expens and canopy at Petedge.
http://www.petedge.com/exercise pens (the canopy is on the same page as the pens. ZW12824