Sleeping Bags

***UPDATE***

Solved.  The Western Mountaineering bags CLEARLY have more loft than either of Stefan's bags, and loft=warmth.  But... since we're still apprehensive about -20 or colder temperatures, we're each going to bring a lightweight (30-deg) bag as a liner.  We're also going to have vapor-barrier liners and bivy sacks so that should be plenty.

- Jacon

^^^UPDATE^^^

So Stefan has generously loaned us his -20 and -30ish degree sleepings bags and thus the debate rages on.
Is 2 pounds 7 oz of 700 fill down going to be as lofty and warmer than 30 oz of 850+ fill down?
Is 2 pounds 9 oz of polarguard going to be warmer?
Is the slight boost in warmth going to be worth the significant increase in total weight of the bags.


These are the last minute questions we're struggling with.  Hopefully we'll figure it out and bring the right gear or else we'll be spending some very cold nights together.
With a few days left all that's left is dinner with the family, seeing a few friends, and finalizing our packing and checklists and figuring out how to get to Boston for our flight on Tuesday (potential ride from Jacon's mother?).


Should make for an interesting, fun filled weekend.


Cheers