New-old school! If they used LW bag fabrics they could probably slash the weight quite a bit. My hunch is the waist belt is the limiting factor WRT weight capacity--it appears flimsy in the photos. Frame flex could come into play, but impossible to tell.

Based on my experience with bicycles, it's hard to leverage much weight savings using Ti versus Al. The real benefits seem to be in strength, ride comfort and responsiveness, but it's all rendered moot by CF, which saves oodles of weight. (The oodle is an obscure metric unit of measure--you might could look it up.)

If somebody truly desires to resurrect ex-frame packs (which have a lot of benefits) they need to invest in the moulds required to fashion the frame from CF. Not out of the question for one of the larger makers.

cheers,