So I got my size medium "Granite Gear Round Rock Solid Compression Sack" from Amazon:
I was able to easily stuff both my full length bottom quilt (20 deg) and my top quilt (20 Deg) + my Hammock Gear pillow:
You can see that it compressed down very nicely
I just thought that you all might like to know that these little guys are an option for these awesome Hammock gear quilts. And I stuffed them in without putting them in the "factory" stuff sacks first. I think that is key to getting them both in the sack comfortably.