Jonathan wrote a review of MontBell U.L. Super Spiral Hugger #0 Down Sleeping Bag: 0 Degree on April 12, 2012
I've been a huge Big Agnes fan over the past few years and have relied heavily on the Fish Hawk (30deg) and Mystic (15deg)- recognizing, that like most bag brands, you need to add at least 15deg to the reported rating to be comfortable. I finally decided that I needed to add a zero bag to my arsenal and opted for the Big Agnes Storm King. After a couple of sub 25deg trips I was unimpressed with the thermal rating and returned the bag (thanks Backcountry!). I conducted some research, balanced costs (wanted to stay under $450), and gave the MontBell UL SS #0 a whirl. Hit low to mid teen temps for a couple of nights and had to remove the mid-weight underwear I wore to bed (I do tend to sleep cold). Ended up in shorts and a t-shirt after another hour and partially unzipped my bag. I feel confident that this bag would "comfortably" perform down to its reported rating. I loved the extra room the elasticity afforded (created as much room as any BA bag I own) and appreciated that it stayed "tight" against my body at rest, minimizing any cold spots created by a "baggy cut". To date: a solid, light weight bag that performs to specs. Well worth the money! I recommend you visit the MontBell site to learn the difference between their three #0 bags (down weight/ stretch size) as well as which one has the most DWR protection - incidentally it is this one, rated for 100 washes.