Just for illustration let's poke up that Duluth roll at 10lbs without insulation and compare it to a simple and not especially fancy set up using a bit of surplus:
I'm looking at
this modular system that also weighs 10lbs. This system has both water resistance and insulation for its 10lbs. It declares that it is good to -30. I'm a sceptical sort so let's have 10 off that and call it -20. How much weight of blanket do we suppose might need to be added on top of the Duluth's 10lbs to get equivalent performance?
Next lets consider the often cited melt hazard thing. Solution, chuck something like
this over the top.
Both the Duluth and the surplus + fireblanket combo are about $200. Can anyone think of any criterion that the combo won't blow the Duluth completely into the weeds at? I'd be interested to hear replies 'cos I can't think of any, and it only took a very modest set up to achieve that.