Pet Life Everest dog backpack features authentic seat belt material straps and a DuPont heavy duty buckle to secure weight and adjusts at the belly accordingly. It is made of ballistic nylon material. Features a waterproof interior and zipper to seal off any and all liquids. The reflective strips on both sides are an important safety component. Outer lined with high quality and breathable mesh fabric where it gently hugs pets body. It is lightweight and durable. The zippered pocket features room for any essentials. The backpack is also a harness and features a harness ring that can attach to any leash. Available in blue/gray color and medium size.