I got this for camping trips. I wasn't sure the dogs would even go in much less stay in the pen. They actually love it!  There is a door that opens up so they can go in and out. It closes up when you need them to stay in.  My dog shown in the photo weighs a little over 40 pounds.  There is a floor you can attach and a screened top that zips on.  It folds down and has a case to store it in. It's about 20 inches by 27 inches when in its it's case.  Lightweight and easy to carry and store.  It will do well on our camping trips, even if just for a quick place to keep the pups safe while we set up. Perfect.