I was looking at Western Mountaineering bags and I'm trying to understand the potential of two features.
Continuous baffles: I understand the down can be shifted to the top of the bag. My assumption is that it adds warmth to where it counts but with a nonstretchy shell the loft can only increase so much (loft was a huge variable on the BPL article for bag warmth) and the down becomes more compact (multiple threads cautioned about wearing too much clothing inside to avoid compressing the down). Is my assumption correct and roughly how much warmer is the bag (a few degrees or 5+ degrees?)?
Second, Western Mountaineering offers additional down for some bags. And again, anybody have a rough idea how much warmth this could add?
Thanks.

