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Another big +1 on the 20* incubator. Very toasty and sold by about the best vendor you can find.
I do highly recommend also getting some Dutch quilt hooks. You can sew them onto a few points on the hammock and hook the quilt to them. Helps keep the quilt from shifting off your foot and/or shoulder during the night.
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Blackbird UQ Choices?
I use the 3 season and winter Yeti under quilts. Never had a reason to change. They fit perfect and are light. I had to extend the shock cord suspension just a tad for my XLC Blackbird but not by much.