[quote=Steve C]
If you'll be inside a hut at 14K, you won't need a huge bag, since the hut will stop all wind circulation. [/quote]

Last time I was there in winter 1997 , orizaba was windblown and it took two people to open the hut door. Inside I was comfy with a cheap rectangular Campmoor 0 deg bag. But now I am older.

I have no intention of taking my -30 bag in a wheelbarrow. The silk liner and/or clothes inside makes sense.I had a night at Lake Ediza about 5 years ago, 18 deg in August, fleece top and rainpants on legs, plus socks of course, and did sleep. So improving the ancillaries with the +20 makes sense.

Sorry to be hijacking, but at least it is on same topic