OLizee Portable Pet Carrier Backpack Legs Out Front Dog Carrier Hands Free Pet Travel Carrier Sturdy and comfortable. Made of high quality soft canvas, with mesh fabric to ensure ventilation. Convenient and lightweight. Hand free design, you can carry it at front and back, easier to take care of your pet; the whole carrier weights less than 9 ounces. Functional and safe. Velcro, zipper and elastic side openings to hold your pet secure and comfy inside; head out design, to hold the whole pet and let your pet enjoy a soothing stroll; additional interior lock to fix your dog's collar for not skipping out. Adjustable widen shoulder strap, with buckle to fasten around your waist. Please measure the widest place of front chest, be sure to set aside 1.2-1.6 inches. Size S: for pets weighting up to 5.5 pounds, with chest less than 11.8 inches,; Size M: for pets weighting up to 7.7 pounds, with chest less than 9.8-15.7 inches; Size L: for pets weighting up to 12 pounds, with chest less than 13.7-18.9 inches.