Trystan W.wrote a review of Sierra Designs Cal 6 800-Fill DriDown Sleeping Bag: 0 Degree Down on June 20, 2013
Familiarity: I've used it once or twice and have initial impressions
Got this bag to replace a North Face Snow Leopard. By comparison, this bag is the godhead :P Just as warm but a 1 lb lighter and consumes 24L less volume in my backpack. I've taken it on 2 overnight trips; Mt. Baker and Mt. Daniel. I run cold but roasted when temps were 38-40F one night. The bag is really comfy for me when temps are in the mid 20s. Haven't had a chance to test it much below that yet. Seems like the stuff sack it ships with is a little large and could stuff down further with another sack, but it's fine as-is in a 60-70L pack.