★ This is the Simply Plus XL size. ★ I assembled it with the intention of using it for a large rabbit, but the size didn't fit, so I folded it up and stored it without ever using it. ★ It has casters (removable) and is very sturdy. There are two doors that open, and the bottom tray can be pulled out, making it very convenient. ★ It has a handle, so it's easy to carry. ★ Easy to assemble, no troublesome screws or anything. ★ Can be used for animals other than dogs (cats and small animals may need a mat on the bottom). ★ Can be shipped immediately. Thank you.