Thank you very much for the detailed feedback. It’s timely for me as I’ve been going back and forth between the 80 and the 40 and after a call to Mosko I was convinced the 80 was the best choice but I don’t want a lot of stuff in my way in technical terrain. Good to know about the Mojavi. I pack pretty light but do sometimes need to carry quite a bit of fuel so for that reason I may choose the 80 . If money was no issue would you still choose the 40 for its compactness and do you think the compression straps would lessen the profile of the 80 when not fully packed ? Really enjoyed the report and the photography - especially some of the artistic ones like the patterns in the sand . Thanks again for the info .