I bought this intentionally too large for my Chiweenie so he would have extra room. While the top zipper section is NOT as secure as i would like this is a substantial and furbaby friendly unit. The vet was very impressed with it and asked where she could purchase one for her furboy. It's a bit unwieldy because I bought it this large, but I would definitely do it again. EXCELLENT buy AND it folds down when I want to store it.