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The new SnugPak softie elites have a special extra streachable panel arrangement which expands the bag for movement and airflow when warm.  It zips away as an zip baffle to tighten up the bag and retain heat when cold.  They also have a box structure foot area to prevent restriction at the foot end.  In fact the foot area is strengthened to allow the squaddies to sleep with their boots on!  Only downside is a little extra weight but at just over 1k for the elite 3 I think it is bearable. Compresses down to a palm sized ball too.

All the freedom of a square bag with the extra warmth of a mummy when needed.

edit...Sorry, just noticed you want down.