It's a original Fjäll Raven Sherpa 80L Trekking Backpack with lots of possibilities to get the most of a backpack. It has a unique frame at the back where you can easily extend the capacity.
Good used condition, has done some great adventures, absolutely recommend, just need a bit more flexibility, so have to switch unfortunately. It has a few smaller damages, but none is hurting in functionality or safety. Just take a look for me pictures here:

app.box.com/s/r0tl0wc5ajjdcirs0j2c1aklywo8bbek