this is SD's zero degree flex ultralight bag. this…
Fill: 800 down
Temperature Rating: 0
Weight: 2.1 pounds
Price Paid: $269
this is SD's zero degree flex ultralight bag. this is the first bag i've owned that i could actually sleep in with my arms over my head and still stay warm. i'm sold on the flex construction method. it really lets you stretch out in the bag yet keeps the down close to you eliminating cold spots. with 800 fill down and no zipper, the thing weighs in at just over 2 pounds. can't beat it. i had it out in minus 10 wind chills and slept comfortably. the down side is the price. i paid $269 on "clearance" at REI. the other problem is it doesn't look like sierra designs is making it any more. i don't see it in this year's catalog. if your looking for a warm, comfortable, spacious zero degree bag that doesn't weigh much, this is the one to get.