Bought a couple of synthetic down bags in Aus a few years ago.
Too bloody hot for there, ended up with a synthetic lightweight Doona - much more comfy for 12-15C nights camping in SW WA, off the bike (BMW LT1200 luxo barge).
Used one in the Holdsworth Park (Totara Flats hut), on Kaikoura's weekend of earthquakes.
Rated -5C, so still too warm, quite cheap in Aus.
Sweated my bollocks off in it, but should be reasonably warm, even if it's snowing - but best in a hut I'd think.
In its sleeve pack - about 300-350mm long, 150-200mm diameter packed - squeezes into a 35L pack easily, for a 2-3 day trip.
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