Originally Posted by Miguel
I wouldn't want to carry 20 degree UQ all summer. I would consider one of Mac's IX UQs instead. I have the full length Shamu which I believe weighs 10oz and by most people's standards is good down to the 40s and perhaps lower. My full length 20 degree down UQ weighs 1lb 9oz. My Shamu is one of my favorite pieces of gear once the temps start to rise...plus there is no down to get wet.
Is this more of a weight concern or a warmth concern. A 3/4 20 underquilt with a M50 shell and Nobul1 liner and 9 oz of 850 down is probably only a couple ounces heavier than your Mac's IX quilt.