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      Big Agnes Bellyache Mountain SL Sleeping Bag

      Big Agnes Bellyache Mountain SL Sleeping Bag

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      • DownTek 700-fill-power duck down repels water employing nano technology and a proprietary process to apply a micro-thin polymer to the down
      • DownTek down repels water and maintains loft and insulation value, even when exposed to moisture
      • Proprietary application process creates a water repellent, antimicrobial and antibacterial down insulation that actually floats on water
      • Vertical chambers with internal mesh gates keep insulation from shifting up and down
      • Traditional style mummy bag is designed without the integrated pad sleeve (normally found on Big Agnes System bags) and features full insulation underneath
      • European Norm (EN) is an independent third-party temperature rating, allowing accurate comparisons across brands with other EN-rated bags
      • Ripstop nylon shell has a water-repellent finish to shed water
      • Nylon taffeta lining is soft and breathable
      • Down-filled collar at top seals around the neck to prevent warm air from escaping and cold air from entering
      • Large draft tube located behind the zipper prevents warm air from escaping and cold air from entering
      • Interior fabric loops stabilize a sleeping bag liner, sold separately
      • 2-way, full-length YKK zipper zips to other bags of opposite configuration
      • Big Agnes Bellyache Mountain SL mummy sleeping bag includes a mesh storage sack and a nylon stuff sack


      Big Agnes Bellyache Mountain SL Sleeping Bag

      Specification Description
      Best use Backpacking
      EN lower limit (rating for men) 17
      EN comfort (rating for women) Unavailable
      Temperature rating (F) 17 degrees Fahrenheit
      Temperature rating (C) -8 degrees Celsius
      Weight 2 lbs. 7 oz. / 2 lbs. 10 oz.
      Shell Ripstop nylon
      Insulation type Down
      Water-resistant down Yes
      Fill 700-fill duck down
      Fill weight 21 / 23 ounces
      Lining Nylon
      Sleeping bag shape Mummy
      Fits up to (in.) 70 / 78 inches
      Shoulder girth (in.) 60 / 62 inches
      Hip girth (in.) 54 / 56 inches
      Stuff sack size 9 x 17.5 / 10 x 17.5 inches
      Stuff sack volume 18 / 23 liters
      Gender Unisex
      Weight - metric 1.1 / 1.1 kilograms

      Big Agnes Bellyache Mountain SL Sleeping Bag

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      Rated 3out of5
      by fromComfortable but Cold I was pretty cold in this bag at about 32 degrees.
      Date published: 2013-05-01
      Rated 4out of5
      by fromI just can't fit I love everything about this bag except the one thing that means the most....I don't fit. I'm a big guy, about 6'2" and 260. I ordered this based on REI's recommendations as it's the biggest mummy style bag that Big Agnes makes. I tried it in a t-shirt in my house for a few minutes and it was tight but I made it. When I got out and needed to wear a pullover also, it wouldnt' zip up. It was very warm but just too snug. I'll be ordering a traditional Big Agnes rectangle bag and sacrifice pack space for the roomy bag. Otherwise I loved it.
      Date published: 2013-10-09
      Rated 5out of5
      by fromCouldn't believe it! I've only used the sleeping bag once so far, but it was on a night when temps dropped to around 15 Fahrenheit. I was freezing as I climbed into the bag, but (with my liner) I was soon warm and cozy the whole night through. This was definitely a splurge for me, but I know that I'll have the bag for a long time, so it was definitely worth it. Very comfortable, very warm, very roomy.
      Date published: 2013-01-09
      Rated 5out of5
      by fromPerfect 4 season bag for Southern US Own this and a Feathered Friends Lark UL 10. Love them both. This one is a bit roomier as it is a few inches wider. I like the fact that this one has sew in loops that allow you to secure a bag liner which will add a few degrees of warmth. Great bag that packs small and resists moisture.
      Date published: 2013-05-20
      Rated 5out of5
      by fromLoved It! I purchased my Big Agnes bag for a late season trip to the Boundary Waters and loved it. While expensive, it was worth it. Temps dipped to near freezing and I was totally comfortable. The little collar flap thing was a helpful extra that helped keep cold air out. The claim of still working well when wet really appealed to me but fortunately, I didn't get to test that claim.
      Date published: 2013-09-27
      Rated 5out of5
      by fromGreat bag I use this in conjunction with an REI Trekker sleeping pad, and have found the Bellyache to be toasty all the way down to 20 degrees F. I haven't slept out in weather colder than that yet. I have slept in my car, which does not vent well, and the down was not at all affected by any of the humidity inside the car. Sleeping in long underwear and a beanie, I have had some of the best night's sleeps I've ever had outdoors. The draft collar seals you in nicely. A feature that is as great as its warmth is its venting. I've slept soundly with the bag unzipped in temperatures as high as the low 50s. It packs small, lofts in a few minutes, and warms quickly. Zipper does catch occasionally, but they have a beefier fabric around the zipper so it's not a big deal. Un-jams easily. I can count the number of feathers that have escaped on one hand (have owned this since Oct 2012). I have not been in truly wet weather yet, so I cannot comment on how well the DownTek works in that environment. I have, however, taken it on winter camping/backpacking trips in Yosemite, Zion, and Death Valley. This really is my favorite bag yet.
      Date published: 2013-01-07

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