I'd definitely bring along some backup insulation to add for those temps until you get your setup dialed in. Just a pad should get you through. Low 30s is about my limit with the JRB set even with it set up properly.
Or if you have another top bag for those temps, doubling up the JRBs would be more comfortable and should easily keep you toasty at 32 F, even allowing some fudge factor for the air gaps.
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