Size L Chest circumference: 36 - 48 cm Hind leg: 31 - 38 cm Dog weight: 3.5 - 6.5 kg < /p> Size XL Chest circumference: 42 - 63 cm Hind leg: 39 - 43 cm Dog body weight: 5.5 - 9kg Size XXL Chest circumference: 50 - 68 cm Hind leg: 43 - 52 cm Dog weight: 8 - 13 kg Details Secure inner collar rope can be attached to pet leash or harness that prevents your pet from jumping out.- Flexible neck, adjustable buckle to hold your pet better. With zippers on both sides, easy entry for the dog.- Pets can stretch their legs easily, enjoy a comfortable journey.- Foam padded back and shoulders reduce shoulder strain and pain. You can use it as a pet backpack or pet carrier bag.- Lightweight, comfortable to carry. The straps carry the bag vertically, which is very practical.You can also wear them with the straps crossed to prevent the backpack from slipping off your shoulders.- Designed for traveling with pets, riding, hiking, cycling, walking and outdoor activities.