HIGHLY TRANSPARENT CASE: The transparent capsule provides your pet with a wider view of the outside, so they won't feel scared or alone in the bag..MORE SPACE: Our square space design leaves plenty of room for cats (up to 20 pounds) to turn around and enjoy a comfortable outing inside the pack..VENTILATED AND BREATHABLE: The enlarged vents on both sides provide optimal ventilation for this backpack. It is also easy for pets to get in and out..ANTISCRATCH AND ANTESCAPE: Made of 600d oxford fabric and nylon mesh, not easy to be scratched. Builtin harnesses to prevent our furry friends from escaping..STRESSFREE BACK: The shoulder straps are sewn with pearl cotton and mesh for comfort and breathability. Equipped with chest buckle to reduce the pressure on your back.