In reply to Rampikino:
I've got Montane Atomics and they're very good - can be tightened around the lower leg so they're not flappy. I use them for hiking, cycling and general outdoors stuff too, but I agree with the others that if you only want them for kit check then some of the cheap cag in a bag type will do.
I carry my waterproof trousers every time I run on the fells but have never, ever run in them! The only time I would put them on in a race or on a training run would be if I was injured and needed to retain heat. Breathability wouldn't matter at all in that scenario, so I don't think there's much point paying a premium for it.