Chris
As I think about this, most of gear is ancient. My only "modern" sleeping bag is my WM Iroquois and its maybe ten years old and has a - gasp - non-waterproof shell and weighs 27 ounces. Its my normal summer bag and I sleep in it in my fleece pants and a jacket if its cold. Next is my Marmot Pinnacle with dryloft shell and I'm not certain what it weighs, maybe 42 oz? I'm not sure, but its made with "850" down and conservatively rated at 15 degrees. My 20 year old WM super kodiak goretex winter bag with an extra 4 ounces of down in the draft tube and a couple of mods weighs 56 ounces. A lot (most) of the UL sleeping bags are cut very small, I couldn't sleep in them.