This product has 2 sizes to choose from, please measure the size of your pet before buying: M: length 38cm/width 21cm/chest circumference 48cm/left and right foot spacing 6cm/front and back foot spacing 14cm L: Length 43cm/Width 24cm/Chest circumference 64cm/Left and right foot spacing 6cm/Front and back foot spacing 16cm The back shoulder strap and the surface are made of waterproof Oxford cloth, which is dry and does not absorb sweat; the honeycomb double-sided mesh fabric design can keep fresh and breathable even in the hot summer; Soft cotton pads are added to the shoulder straps and back to reduce the load; the single-sided zipper design is convenient to wear; there are pockets on the side to hold things, and 500ML of mineral water can be stored; The safety rope design can lock the pet leash, truly liberating your hands; five openings, extensible hands and feet, the lock is delicate and soft, and does not hurt the dog's skin; The hands-free pet carrier can be worn on your front or back at will, allowing you to be closer to your pet when you are carrying a cat or dog, and increase your pets sense of security. At the same time, the thickened foam pad helps to reduce the burden on the shoulders. This backpack is light and portable, so you can use it to carry a puppy or cat on a bike, hike, camp, walk or meet friends. It allows owners and their cute pets to have more adventures together. More importantly, it is also a good photo prop, which can take interesting photos for daily sharing .