A sleeping bag suitable for -18C use will be bulky. You can get half the bulk of a synthetic bag if you select high specification down with 700 Fill power - 800 (very rare) and 900 fill power doesn't really exist. The down bag will weigh a minimum of 1.6 to 1.7 Kg mostly dependent on the size as some of the lighter bags will have a very tight fit i.e. for mountaineers who tend to be quite lean even compared to today's military personnel). Cost of the down bag will be between $400-600.
A synthetic bag will be quite bulky and will typically weigh between 2.8 to 3Kg. Synthetic bags, which will go down to such low temperatures are actually few and far between. There are some bags from Snugpak. Cost will be approx half that of a top end down bag.
This is essentially the sleep system I will use for cold weather. (comparison in size and weight to the US Modular Sleep System)
http://www.youtube.com/watch?v=fES2kb29smwI will also use an Snugpak Expanda Winter Panel for use with with the Snugpak Osprey 12, which allows more volume if a were to add a secondary down liner bag.
The Softie Reversible tops and bottoms and the Snugpak 12 Osprey and Expanda Panel weighs around 3.5 Kg. The Softie suit is also a good idea if you need to go for that middle of night call of nature.
http://www.snugpak.com/outdoor/expanda-panel-winterYou will also need a full 5 season, full length sleeping Pad. Expect it to weigh another 1+ Kg.
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