i've never been big on compression sacks, i always just stuffed my bag into the bottom of my backpack and after carrying it around like that consistently for a couple years low and behold my loft is crushed, limp and not all that warm. The only way i feel anyone going for the long haul isn't gonna end up with a fucked up bag is by draping it over your shoulders constantly while you walk around.
I'm beginning to believe that the insulation they use get brittle with age. I haven't hear of any sleeping bags that last long at all. They did come up with a kind of corrugated space blanket, but like the regular space blanket, it's still noisy though...