For future reference, zpacks makes the lightest couples quilts http://www.zpacks.com/quilts/twinquilt.shtml
I don’t have one but am saving up.

For the last 12 years my wife and I use a WM Megalite (24oz) --- opened up. I bought a mating zipper from WM and my wife sewed it on a triangular shaped piece of micro-fleece fabric (9oz). This is similar to the discontinued Sweetie Pie Extender.

When it’s cold out, we have the down on top. When it’s warmer, we flip the bag over.

Just more ideas…
-Barry
-Mountains were made for Tevas