I like shiny carbon tubing more
This pack has magnesium ally tubes so hopefully will be a little bit lighter than your average throwback. Will give me something to play with though. If the concept works ill let you and
@gixer debate the ramifications of carbon frame meets mountain terrain
Love carbon fiber and i recon it's a great material for soooooooooooo many things.
The fact that you can lay up the fibers and layers to give as much rigidity or flex in areas make it great for bikes.
Problem i've had with the material on MTB's is it's lack of impact resistance.
Recon i've had 3 carbon fiber MTB frames every single one has lost chunks from impacts.
I bought one from the top MTB maker, a large stone got flicked up by the front wheel and took a chunk out of the downtube ON THE FIRST RIDE
I still recon it's the best material for road bike frames.
For me Ti just kicks ass for MTB frames though.
Great impact resistance, doesn't corrode, no paint to chip, a quick going over with some wire wool every year or so and it comes up looking like new.
My full susser is Aluminium (Trek EX) the paint is chipped everywhere and it's only 7 years old
My Diamond back axis TT (Ti) is well over 20 years old and looks like new
A carbon fiber rucksack frame is going to be a tough project.
If you get it made out of CF tubing then the joints are going to be a weakness
If you get it laid up as a one piece frame the mould alone is going to cost 4 figures
Even then in my experience the edges/corners are going to be prone to damage.
Steel would be the easiest, some thin gauge Reynolds tubing should be fairly lightweight.
You could even braze or butt it yourself.
Only downside would be rust eventually.