Melissa Warrenwrote a review of Big Agnes Mystic UL Sleeping Bag: 15 Degree Down on February 16, 2018
Familiarity: I've used it once or twice and have initial impressions
This sleeping bag kept me super warm on a 25 degree night when I was staying in a yurt. At first, the yurt was cold and it kept me super warm! Once it was heated up, I slept with the bag unzipped and it was perfect then as well!
This sleeping bag is also super light! We hiked (skinned) to the yurt and carried all of our gear, so having a light down bag that compresses well was key. This helped me keep my bag in a reasonable weight, while also being warm enough.
The shape of the bag is wider than my other bags, which was nice to have the extra space! It has a feature to attach to a Big Agnes sleeping pad as well, which would keep the bag in place as you move within and prevent it from twisting. Between that, the warmth, and the packability, I highly recommend this bag!