I have four metal xpens that I couldn't do without at all. Each one has eight 24" wide panels that are 24 inches tall. I can connect them all for a very large area to play in outside. When we travel, I take at least two of them with us so we don't have to tie them to a table or chair leg when we pic-nic or visit anyone. We take them to connect with others expens when we have meet-ups. We also take them with us when we take the motor coach so we can put them around the side of the coach and fence an area. Hard to explain. I'll just post a couple of pictures instead.
Easy Exercise Pens for Dogs | PetEdge.com