Comfortable to wear: padded shoulder straps reduce back and shoulder pressure, breathable material. Easy to adjust safety straps, more secure. 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 oxygen, side zipper opening, easy for pets to get in and out. The removable mat makes it comfortable for pets. Convenient pocket to hold a water bottle and poop bags. Size S about 323025cm (lengthwidthheight), the pet backpack is more suitable for cats and small animals under 3kg; Size L about 453630cm. (Length * Width * Height), the pet backpack is more suitable for cats and small medium breed dogs under 6 kg. LRFR is committed to providing each customer with the highest standard of customer service possible.