For all of you out there that love aarn packs (myself included) and have been after a truly lightweight pack, some potentially good news. This is taken from the news section of aarn's website:
"We are in the early days of investigating how to use Cuben fibre in some of our Ultralight models"
"The process for achieving this means that it is a very expensive fabric, approximately 10 X the price of nylon. We could expect that bodypacks in Cuben might be double the price of regular models, but perhaps 2/3 to a half the weight. We will keep you up to date as these developments progress"