one gets an awful lot of warmth from a SnugFit. Genuine Draft's pack is ALWAYS heavier than mine because of the amount of cold weather gear she takes (weather weenie). I guarantee you that you'd lose a hand (if you're lucky) trying to take my SnugFit out of her pack. I bought and paid for it and I don't even get to use it very often.
Heavy, but if one is sensitive to the cold, it is a sweet UQ solution.