I'll throw Underground Quilts into the mix also.
"We don't stop hiking because we grow old,
we grow old because we stop hiking."
-- Finis Mitchell,
I used an old down sleeping bag I got off ebay for cheap before I got my UG flight jacket.
Zipped it up from the foot box to the knees. Worked fine, but was not warm enough for around here when it got cold. The UG is much better.
Love is blind. Marriage is an eye opener.