This pet backpack is made of durable high-grade polyester. The shoulder strap and back material are in contact with the body and are made of a mesh material with good moisture absorption and breathability, excellent fit to be used from hot to cold seasons. There are three different sizes. You can choose one according to your pets weight and length. The zipper and elastic band opening will make the backpack a comfortably fit your dog. Built-in adjustable safety lock can connect with pet's collar which will prevent the pet from getting out of the bag and keep them safe. Its designed with waist buckles to give you extra support. The hard bottom cover allows your pet to rest better, and it can be removed and cleaned easily. Side and front pockets can be used to store a collapsible pet bowl, snacks, mobile phones, and more.