Armarkat The portable playpen can hold one large dog or entire litters of kittens and puppies. The playpen sets up fast and folds flat to go into its carrier bag. It has a zip-off top and outside pocket for treats and toys. This item is water-resistant and is constructed of extra-strong polyester fabric with mesh vents for visibility and air. The portable playpen is lightweight for outside or indoors, but tough enough for travel.