Features 1. Dog backpack suitable for small and medium-sized dogs: This dog backpack comes in three sizes: S, M, and L. You can choose according to your pet's weight and back length. 2. Suitable for all four seasons: This dog backpack is made of durable high-grade polyester fiber. The shoulder straps and back material that come into contact with the body are made of mesh fabric with good moisture-wicking and breathable properties, which fit the body and are suitable from hot seasons to cold seasons. 3. Dog backpack: It features a zipper and elastic opening design, allowing the backpack to fit your dog comfortably. It has a built-in adjustable safety lock that can be connected to the pet collar to prevent the pet from escaping from the bag, ensuring their safety. 4. It is designed with a waist buckle to provide you with additional support; the hard bottom cover enables your pet to rest better, and the bottom cover is removable for cleaning. The side and front pockets can be used to store foldable pet bowls, snacks, mobile phones and other items. 5. Two wearing methods: This hands-free puppy backpack can be worn on the front or back according to your preference. The neck window with a drawstring design allows your pet to stick its head out, providing ventilation and making it easy to observe, increasing the intimacy during interaction with you. Specifications - Material: Polyester fiber - Colors: Green, black, blue - Sizes: S: 34×30 cm, M: 45×36 cm, L: 55×41 cm - Weights: 400 grams, 500 grams, 640 grams Package contents 1 dog backpack