Pesp&reg; Fashionable Durable Dacron Cotton Mesh Pet Dog Cat Legs Out Travel Front Backpack Carrier Bag It is made of Nylon with good breathability, soft padded back with 4 holes for legs out and 1 hole for tail out ,giving your pet a comfortable and relaxed feeling. Let your pet enjoy a soothing stroll while keeping your hands free. Adjustable shoulder strap can reduce the burden, suitable for long walking and travel. Good breathable mesh and durable design give your pet a comfortable space and safe protection. 1#:Total length 28CM/11.02",Bust 35-40CM/13.78-15.75",Front and rear legs 19CM/7.48",Suitable for about 1.5-2.5 kg/ 3.5-5.5 lb 2#: Total length 33CM/12.99",Bust 42-47CM/16.54-18.50", Front and rear legs 24CM/9.45",Suitable for about 2.5-4.5 kg/ 5.5-10 lb 3#: Total length 38CM/14.96",Bust 48-55CM/18.89-21.65",Front and rear legs 28CM/11.02",Suitable for about 4-7 kg/8.5-15.5 lb 4#: Total length 42CM/16.53",Bust 58-65CM/22.83-25.59",Front and rear legs 32CM/12.60",Suitable for 7-10 kg/15.5-22 lb