Im also running a Revelate Designs handlebar harness and bag for my sleep system along with a Revelate feedbag and a Rockgeist top tube bag for my charging system/electronics
Fortunately my climbing partner is an ER doctor and has a very high tolerance for epics, but it was one of the colder experiences of my life
The Stella SW has that distinct Japanese buttery smoothness and quiet running, it is "reliably reliable" for the lack of a better description, and I am yet to see anyone who faults the mind-blowing drag performance
If the weather is nice I cannot over-state how cool bivvying is If its not nice, then a basha means youll still have fun
Its more expensive than the Matador Freefly, but its upgraded materials and more-robust stitching and build may make it worth its higher cost for certain people
Sizing Ive reviewed the Vango Freedom II 60+20, but you can also buy the Freedom II 80+20 if you are looking for a really large pack