Safety & Comfort Mat - A safety clip is added in the dog backpack, you can put a harness or collar on your pet and hook it with the clip, which can prevent pet escapes when the zipper from being accidentally opened. There is a soft flat mat included in the backpack, making your pet to stand, sleep or land comfortably. Free Your Hands Bag - A new way for pets to travel around, the carrier backpack can be used to carry your pets to grooming shop or to the vet. It fit for cats, dogs, birds, rabbits, mouses and other small animals that are unable to walk outside for a long time. More Air & Ventilated - The pet backpack has a total of 12 large breathing holes (including 3 breathing holes on the space cover), plus the mesh design openings on both sides, which will make pets to breathe more fresh air in the backpack.