K9 Sport Sack Kolossus - BlackBring your big adventure dog everywhere with the world's best big dog backpack carrier, the K9 Sport Sack Kolossus. This extra large dog carrier backpack is designed for comfort, safety, and hands free exploring. The huge size is perfect for larger breeds who have outgrown standard dog backpacks, offering you ergonomic support while your dog rides securely, close to your body on hikes, bike rides, and city walks. This unique large dog carrier backpack