Ok, so I suppose I should elaborate a little more on the details of my design.
I'm basically trying to make a light version of an Osprey Atmos style pack and harness system by using lighter materials like Cuben and Carbon fiber, and keeping the extras to a minimum.
Shoulder straps and hipbelt - Perforated foam sandwiched by mesh
(For this application I don't think I would need the padding of the 3D mesh, and I don't want a solid material)
Backpanel - A sheet of mesh being stretched to shape by an arched X frame made of carbon fiber tubes. (I understand there may be a small initial amount of stetch, but I need something that isn't going to stretch out over time, if that makes sense. It needs to stop stretching at some point so the carbon tubes stay arched.)
I'm shooting for an under 10oz internal frame pack that will offer great breathability. Maybe not possible, but I'm gonna shoot for it.
Knowing that most of the weight of a pack is in the harness system and straps, I'm trying to find the lightest materials that can hold up to this kind of use.
Imagine shrinking down this tent design, and adding a sheet of mesh on the inside(of one panel), and the outside of the tent panel would be the inside of the pack.
I'll also probably start another thread later on about the weight difference of grosgrain, nylon webbing and ladderlocks, and cord and cordlocks.