Features 1. Dog Carriers for Small & Medium Dogs: The dog backpack is divided into three sizes, S, M, and L. You can choose according to your pet's weight and length of the back. 2. Four Seasons Universal: The dog backpack carrier is made of durable high-grade polyester. The shoulder strap and back material in contact with the body are made of a mesh material with good moisture absorption and breathability, excellent fit to be used from hot to cold seasons. 3. Dog Carrier Backpacks: The zipper and elastic band opening will make the backpack comfortably fit your dog. Built-in adjustable safety lock can connect with pet's collar which will prevent pet from getting out of bag and keep them safe. 4. 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, Side and front pockets can be used to store a collapsible pet bowl, snacks, mobile phones, and so on. 5. Two Ways of Wearing: Hands-free puppy backpack can be worn on the front or back according to your preference. The neck window with drawstring design will allow your pet to keep the head extended, ventilated and visible, increasing intimacy while interacting with you. Specification Material: Polyster Color: Green, Black, Blue Size: S: 34 x 30 cm, M: 45 x 36 cm, L: 55 x 41 cm Weight: 400 g, 500 g, 640 g Package Include: 1x Dog Backpack