We got a playpen from Petco and it just doesn't work well I mean there is no cover and of course they all get out--- We had mesh on the top but I got scratched really bad from it. So we tried a tarp. The littlest one Koi she is 6 months old and chewed the tarp and got out a lot. So I decided the plastic on the floor-- we had some left over and put it on top of the playpen it seems to be working for now. I ordered one from PetSmart that has a cover--- the only problem is that it is backordered. I hope the plastic lasts until that time.