Size Guide: S Chest: 12.5-15.7 inches Bag size: 3.9*1.1*4.7 inches Leash length: 45 inches Please measure your pet's chest before ordering, and be looser each time.HIGH QUALITY MATERIALS: The back of the bag is coated with breathable padded mesh to ensure your pet is breathable and comfortable. The outer fabric is wool, which is durable and soft.Poop Bag Dispenser: This backup is multifunctional and on top of that, it also comes with a poop bag dispenser. It frees up your hands and doesn't require you to hold the poop bag all the time while walking with your dog.LARGE CAPACITY - The dog carrier has a large capacity and can hold collapsible bowls, small toys, poop bags, treats and more. Your dog will be happy to help you let go.Harnesses and Leashes - The chest strap is adjustable and easy to put on and take off. The dog leash is attached by a sturdy stainless steel D-ring. This backpack can be a harness, cargo bag, and poop bag dispenser. This is a great product.