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well they didn't rate it because its not a sleeping bag.
But going by the fill weight and loft I would have expected it to have been ok at 8 degrees

Had kestrel so know it only got to 8ºc because I was awake often and checked it because it felt a hell of a lot colder !

I brought a macpac quilt a few days ago.
Spent last night on it and it got down to 8ºc in the tent.
I know it's only light but I was cold and I run pretty hot in bags usually.
Also don't want to...