The type of dude that builds their own pack is usually also the type of dude that cuts the handle off his toothbrush
Discussion
they also tend not to be engineers
if you kink a bend or otherwise put a big stress riser in it, the base material strength advantage doesn't matter, because the structural integrity is compromised
if you anneal the 6061 to bend it without damaging the tubing wall, it's not strong anymore. annealed 6061 is weaker than 3003
so, use a material that is meant for bending in the first place