The Tough-Shell Wheeled Collapsible Pet Carrier is composed of a Tough-Shell outer exterior and a Soft Shell tough middle exterior. The bottom of this Dog Carrier features All-Terrain tough rubberized wheels for a nice smooth ride on both indoor and outdoor surface areas with an extendable wheeled handle bar. Additionally, this Pet Carrier collapses to 3 inches narrow as the two outer shells collide and zip together. This Pet Carrier comes with Over-The-Shoulder straps and a Built-In Leash Holder inside. Available in Multiple Colors.