Adjustable Side Retractable Window: The retractable window allows the exit size to be freely adjusted to fully close,preventing pets from escaping and making it easier for the carrier to feed snacks to calm pets when they are nervous,without the further irritation of reopening the zipper for feeding.More Feeling Better Ventilation: Gives the dog a window to see the outside world more clearly and gives it a sense of security for itself,while also bringing better ventilation.Easy to Operate: The whole backpack body can be fixed by the zipper connection piece,just easily pull the zipper on both sides to assemble,disassembly also just pull down the zipper can be,convenient to carry,save space.Simple Practical Design: solid color design,can be simpler to match your travel clothing,practical design can bring you a relaxed and pleasant experience on your trip.It can be used as a sling shoulder bag to carry your pet,and handbag as well.Size: Length,16.9 inch/43 cm; Width,9.8 inch/25 cm; Height,9.8 inch/25 cm,good for kitten,rabbit,guinea pig,chinchilla,squirrel,small dog.