I ordered this pet carrier, altho its not a carrier. We are taking 2 cats moving to another state and I wanted  a carrier they could both be in together. this fits the back seat perfectly. I think it will do the job. I can fit a blanket and a small litter box  in thee. with the 2 cats.

Pros: Soft sides, good size for transportating our cats to new home.  Folds up nice for storage.
Cons: Soft bottom, will need a piece of cardboard to sit in bottom so its sturdier. Also NO handles to carry it.. you will have to take the pet out of it to transport.