The fabric was why I passed on the KU line, just don't trust silnylon as a pack material for my uses. My pack usually gets the $h!t kicked out of it during hunting season.
However having said that I have only heard of a handful of issues with the fabric so maybe my fears were unfounded. Regardless I ended up with a very nice McHale custom pack. It weighs a couple pounds more but is extremely durable and carries very comfortably.
