I agree with everyone---get a carrier! They're VERY reasonably priced...even cheap. I used a cardboard type carrier once (when Dulcinea had three kittens...and they were ALL going to the vet---the kittens were in her carrier...hence the box for mommy)---and Dulcinea became VERY upset in the box-carrier (it's much darker in there) and she chewed thru it and got out and ran cazy thru the car...had to stop on the turnpike and try and get her back IN...and hold it shut with one hand and drive with the other (NOT good!) and promised that I'd NEVER ever do that again. Buy a solid carrier! It'll set you back $20-$40 max...and be well worth it. You'll need it from time to time anyway...and when it's not being used...maybe your cat will sleep in it like Dulcinea does. She LOVES her carrier...despite knowing that it will bring her to the vet's from time to time.
Fr. Gregg
Fr. Gregg