In reply to Acrux:
"Weight and pack size is pretty important to me"
So you are going to actually trek in to wild camp / bothy in the depths of winter then?
"he outer is ME's drillite II, which is slightly thicker and more durable than their other fabrics with about 1500mm HH I think"
I'd be wary of any outer fabric that advertises a HH if you tend to run hot or sweaty. It's easy to misjudge a down bag and end up very sweaty in the morning with the bag damp. 1500 HH on a down bag outer is not something I'd want. I'd just use a bivi bag on the few occasions thats needed.
240 is a good price for the quality of the bag.
Remember a bag that goes down to say -15 comfortably is going to be far too hot for most other uses than cold winter camps.
Post edited at 12:01