【Size of Pet Backpack】 Size: M, 36 45 21CM (LHB), suitable for pets weighing between 3 and 7 kg. You can choose according to your pet's weight and back length. Note: Please refer to the size chart before purchasing. 【Adjustable Neck Hole】 The neck hole of the dog front backpack is designed with a drawstring, which can be easily adjusted to allow your pet's head to move freely and prevent the view from being too narrow. The puppy backpack is equipped with an adjustable safety buckle, which can be connected to the pet's collar/harness to prevent the pet from escaping and keep it safe. 【Mesh Ventilation Design】 Made of polyester fiber and breathable lightweight mesh, zipper on the top provides easy access. The backpack has 3 mesh pockets, the side and front pockets are designed for storing leashes, water, snacks, treats and more. Ideal for outdoor travel, exercise, sightseeing, camping, hiking, etc. 【Removable hard bottom cover】 The hard bottom of the backpack is removable, waterproof and easy to clean, so that your pet can feel comfortable and rest better in it. The adjustable shoulder straps and breathable mesh back design are thickened, which can reduce the burden on the shoulders and back, making it easier and more comfortable to carry dogs/cats. Color Green_qq