I was wondering I am going to be ordering a down incubator which with 900 fill will make a - 5 ° UQ now I can't afford to buy a burrow this season but will be using my montbell 650 fill 20 ° bag as a top quilt, would you think I can get to single digits with the the added warmth from the bottom, I eventually want to get a 0 ° TQ whats people thoughts thanks
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