Bepety Pet Travel Bags Dogs Legs Out Front Carriers Cats Portable Outdoor Backpacks Lightweight and Safe for Animals Click the See All Buying Options , then you can add it to the cart Strap Length: 22.4"-40.2" S : Dog Chest--18.1" Dog Weight 0-5.5 lb ; M : Dog Chest--21.3" Dog Weight 5.5-8.8 lb L : Dog Chest--24.4" Dog Weight 8.8-15.4 lb ; XL : Dog Chest--27.6" Dog Weight 15.4-22.1 lb Package Content: 1 x Pet Carrier Backpack