[pct-l] Sierra Designs Isotope jacket

[Tamsin McMahon]

I got one of these for Christmas. Does anyone have any experience with the Isotope jacket as a raincoat?  

My existing raincoat is an Arc'Teryx Gore-Tex soft shell that probably weighs more than a pound and squishes down to the size of a football. So it's staying home.

I love that the Isotope is so light and compact, but how will it do on the trail?

Thanks!
Tamsin