If the cork was the back panel fabric it wouldn't be in the wind much, it would mostly be in the low pressure area on my back. The top edge of the flap style bags nearest my shoulder is what takes the beating. I'll most likely get the newest Buzz regardless, but in cork would put me over the moon.
I love my small org. pocket in the fabric (cork) and almost daily someone tries to swipe it.
Seeing an Imago in cork irritates my bag jealousy to no end, the flagrant bag pr0n photo's by you do not help =)