Is it acceptable to take kitten...

[globex]

.. to the vet in a cardboard box?!
I don't have time to get a cat carrier and her appointment is tomorrow..

Please tell me its fine and everyone does it..

I think it will be fine. Our vet sells cardboard carriers and they aren't much different to boxes. Put something soft in there for her to lie on.

Thanks! I will line it with an old soft towel..

I'm off to make a handle out of packing tape..