Comfortable to wear: padded shoulder straps reduce back and shoulder pressure, breathable material. Easy to adjust safety straps, safer. Premium pet backpack designed with maximum comfort for you and your pet. Leak-proof hook inside the bag to attach to the pet collar, prevent it from jumping out. Good ventilation: large mesh windows on both sides and the top of the backpack provide enough ventilation oxigen, a side zipper opening, easy for pets to get in and out. Removable mat makes it comfortable for pets. Convenient pocket to hold water bottle and poop bags. Size S about 32*30*25cm(Length*Width*Height), the pet backpack is more suitable for cats and pets. small animals under 3 kg; Size L about 45*36*30cm. (Length*Width*Height), the pet backpack is more suitable for cats and small medium breed dogs under 6 kg.