The Wallcreeper PL is a superior design for wearing as jacket, due to the armholes, but its rather weighty.
The frogsac is the other way round, less weight and not allowing full movement of the arms,
Myself, I bought a plain poncho liner with the same weight as the Frogsac, but for a measly € 20,-. Then I had a slit cut and lined around the edges for a headhole. Another € 20,-
Now I have a warm blanket and a warm serape and full movement of the arms.
Pic to follow.
Exped makes a pretty sophisticated "Bivy-Poncho_liner", too:
http://www.exped.com/exped/web/exped...ElemFormat=jpg
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