Need a cat carrier for a few hours to take a stray cat to the vet

Hello,

I am taking care of a stray cat in our society, and I need to take him to a vet. Unfortunately, I don't have a cat carrier. Is there anyone who can lend it to me for a day? Thank you!

P.S.: I don't have a cardboard box that's large enough but I will find one if I don't find a carrier.