Lekebobor Large Cat Backpack Carrier Expandable Pet Carrier Backpack for Small Dogs Medium Cats Fit Up to 18 Lbs, Dog Backpack Carrier, Foldable Puppy Backpack Carrier for Travel,BlackMAXIMUM AIR CIRCULATION & MULTIPLE ENTRANCES: Mesh windows on 4 sides for optimal airflow, 4 entrances (sides, front, and back) allow your pet to enjoy the outside scenery and easy entry into the carrier, and 1 expandable soft mat to keep your pet comfy during the journey EXPANDABLE & COLLAPSIBLE: This pet carrier backpack with an expandable back allows your pet to move around more comfortably and reduces the anxiety. And the carrier can collapse flat