I am leaving on a 56 mile hike Aug 13-18 in the High Uintah Wilderness area. I have two sleeping bags and I can't decide which one I should take. The Montbell #0 is a 0-deg rated down bag and weighs 2lbs. 15oz. I can't find an EN rating, but I think the comfort range is around 15-20 degs. My other bag is the Montbell #3. It is a 30-deg bag and weighs 1lb. 9oz. The EN rating is 40 deg comfort, 30 deg lower limit, and 3 deg extreme. I am NOT using a liner, however I am planning to take a set of Thermax thermals. Any suggestions?

Im actually going up there this weekend, I checked the weather and it says 45 degree lows with chances of thunderstorms.

Im just going to take my 30 degree stoic sommnus (1.65 pounds) and I think ill be okay.

Highs are going to be 80 degrees, but im still going to bring a light jacket and a beanie.

You'll be just fine with the 30 degree bag. Around end of Sept. Is when I start looking at the 15 degree needs. That said, I always have wind shirt, rain jacket and light down jacket for layers that can be used in case of a early snow storm. It's been unseasonably hot this year and I could get by with a 40 degree bag at most elevations- even above 11,000 ft.

Have a great trip!