I just got the Macpac Latitude 700 http://www.macpac.co.nz/shop/en_nz/gear-and-clothing/sleeping-bags/latitude-700-standard-size.html for a bargain price of $374 (they have a great sale on at the moment if you’re looking for winter gear). Now I have never owned a down sleeping bag but know they need to be treated with a bit more care than synthetic ones and never get them wet or you will freeze.
The question is should I stuff the sleeping bag into the bag to compress it or should you roll it up, I only ask because I have been told to stuff it not roll it. Is this true and if so why?