I've been looking at silnylon rainpaints/jacket as a plan B option for backpacking.
I don't plan on doing many miles and the main perk here is if my shelter is destroyed due to a stick or some other insane wind damage during a storm I won't die due to hypothermia :-P
I was thinking that this would also work as a vapor barrier liner while you sleep.
Just use a wool liner (pants+shirt) and then the silnylon jacket+pants and then climb in your sleeping bag.

