wwk10, I made a UQ that should be pretty good down to 40F out of less than one pillow. I was in the 10-12oz range.
What kind of hammock do you have? On a bridge, 45" wide is *really* wide. Mine is about 36" wide and it is just about perfect.
I could buy the 15.75oz measurement for those dimensions. You're going considerably larger than I did, and I've got roughly the same amount of loft.
If - if he stood! Enough of ifs!
He knew a path that wanted walking
He knew a spring that wanted drinking
A thought that wanted further thinking.
A love that wanted re-renewing
"A Lone Striker" Robert Frost