In reply to clay: I own a crux AK 47, I hate it, I'll sell you mine. Other than being very light and having strapping that is, apparently, rated I can't think of a single plus point.
Perhaps the design has improved in the past few years, but I dream about a decent rucksack like my old lowe alpine, or a POD, or a MacPac.
About five years ago I wrote a post along the lines of 10 reasons why I hate my crux. I can't find it now but that summed it up nicely.
Don't be a sheep!