I'm in the process of setting up a kit for Tassie. This is going to be as light as I can possibly make it and still be safe and warm. So I'm looking at sleeping bags that are light weight, probably around the 700g or less if possible but have a good rating, not sure what I need for Tasmania conditions but I was looking at Feathered Friends Hummingbird UL 20, about a -6.5 rating and just a smidgen over 700g.
All other suggestions would be great. My wife and I are starting to plan to move to Tassie and so this bag will get used a fair bit down there