Adelheid,
I found it most comfortable to carry my tripod with a strap
from an old camera bag.
I fasten the strap with a couple of plastic ties, one on the top
around the ballhead, and a big plastic tie at the bottom of the tripod
that I pull over the three legs when the tripod is folded up.
I tried strapping the tripod to the backpack, but the whole
thing becomes too heavy on my back.
With the tripod hanging on its own strap, I can move it
around on long hikes. Less fatigue that way.
It all depends on how much your tripod plus ballhead weighs.
My Bogen seems pretty heavy. I'd like to get a carbon fiber one,
but they're kind of pricey.
Harald Rust