Thank you for viewing! After purchasing new, my beloved dog scratched the inside, resulting in several tears. (Please see photos 4 and 5.) Used twice. The exterior is clean and there are no issues with use, but please understand this before purchasing. This is a type that can be expanded in the back! Cat Carrier Backpack, Lockable, Dog, Pet, Carrier Bag, Foldable, Breathable Three-Sided Mesh and Curtains, Doesn't Lose Shape, Convenient for Evacuation/Medical Visits/Walking/Moving, Gray