It might not be insanely light, but it is the most durable summit pack of its kind. The pack pictured has been used daily for 9 months by the owner of CiloGear to commute to and from work.
It has the same lid design as the normal V3 30L, but it's both a little bit lighter and so much more durable that the normal 30L WorkSack is almost embarrassed.
The Dyneemaź 30L WorkSack might be the ultimate summitpack.