This might be the stupidest question ever - but do you mean a soft crate you can carry around easily, then set up and put the dog in? Or something to carry her in?
If it is the first - I highly recommend the Noz2Noz. They are the sturdiest of the many soft crates I've seen, and mine lasted several years of being drug around to trials, indoors and out, and is still in very usable condition. My dog just decided she prefers wire crates, so I don't use it anymore. Meg is just under 18" and 33 lbs, and the Noz2Noz I have is huge for her. It could very easily fit pretty much every border collie I've known. It isn't something I'd like to cart around town by hand for hours and take on public transportation, but it is pretty easy for me to carry around.
If it is the second, I have no idea!