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Description

A traditional mummy bag upgraded with the power of water-repellent down.

Twelve years ago Big Agnes dove headfirst into the fray of designing gear for the outdoor world. It introduced the unique Big Agnes System (sleeping bags with a pad sleeve on the bottom instead of insulation) and defined a new level of comfort for hitting the sack at night. Now, for the first time since the brand was born, Big Agnes  has revived the traditional mummy bag design and redesigned its insulation and technology from top to bottom. The result is Bellyache Mountain SL17-Degree Sleeping Bag, a technical, three-season sleeping bag that conquers wet nights in the spring and cold mornings in the fall.

Perhaps the most notable feature of the Bellyache is the Downtek Insulation. This water-repellent down retains loft, breathability, and insulation value even if the down itself gets wet from rain or moisture. This gives you a serious advantage over traditional down insulation that clumps and lies flat at the first sign of moisture. Even with high-end insulation, a sleeping bag is only as good as the baffles that hold its insulation and the Bellyache uses Flow Construction, one of the most innovative baffle constructions in the industry. Insotect Flow uses a series of vertical baffles with internal gates that eliminate vertical and lateral clumping by constantly evening the distribution of insulation from head-to-toe, thus eliminating cold spots. Along with draft-stopping features like a seal around the neck opening, a wedge between the sleeping bag and sleeping pad connection, and a no-draft tube along the zipper, this sleeping bag offers reliable, regular warmth throughout the night.

Amazingly, for all its cold-and-wet-weather advantages, this sleeping bag maintains a weight well under three pounds. Along with your insulating layer and a wool hat, this versatile 17-degree bag should be an essential part of your kit whether you're pitching a tarp in the Pacific Northwest or pitching a single-wall in the Carolinas.

  • Cozy 17F-degree temperature rating keeps you toasty-warm early spring through late fall
  • Light and lofty 700-fill DownTek water-repellent down insulation won't clump up or freeze, because it won't get wet
  • Traditional mummy shape gives body-contouring, efficient warmth with some wiggle room
  • Durable nylon fabric shell resists water, and smooth nylon taffeta lining resists stains
  • Draft collar, draft wedge, and draft zipper ensure warm air stays in and cold air keeps out
  • Left- and right-zip bags mate together for a cozy coupling
  • Insotect Flow construction evenly distributes heat with flow-optimization and baffle design
  • Mesh storage sack and nylon stuff sack included for convenient storing and packing

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Big Agnes Bellyache Mountain SL Sleeping Bag: 17 Degree Down

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Here's what others have to say...

Does it come with a compression sack? Or...

Posted on

Does it come with a compression sack? Or its just a storage sack or stuff sack.

Responded on

Hey Pablo,

This sleeping bag comes with a mesh storage sack and a nylon stuff sack. If you need to save a few cubic centimeters in your pack getting a good after market compression sack wouldn't be a bad idea.

5 5

Great bag for the price!

  • Familiarity: I've used it once or twice and have initial impressions

I've yet to use this in the cold. This is even my first down bag. I have to say though that it is amazing. After years of using synthetics, I will never look back. The down is so lofty and when you get in, it traps in so much warmth. I went with this bag because there aren't too many in this price range with this fill power and vertical baffles. The 700 fill may not be ultralight, but it does the job. The bag packs to about the size of a thermarest trail scout, but would be smaller with a compression sack. There is extra down around the foot and head areas. The bag overall is about 3-3.5 in. thick. And while I haven't used this in winter conditions, I slept in it one night in my house and I had to get out of it. It gets super warm. The fabric inside is super soft and is the same fabric on the bottom. The shell fabric on top is a light ripstop. I would say both fabrics are 20-30 denier. The zipper is about the best anti-snag zipper. Very nice YKK 2-way zip. The green color is a nice contrast as well. The neck baffle works well, even though it doesn't completely surround your neck. It can tuck in and block drafts and it makes it feel like a blanket. The vertical baffles keep the down in place and really move with you. I tossed and turned in it as a test and as a person that doesn't sleep still, I say its excellent for a mummy bag. I have no worries taking this to the mid 20's I'm excited for winter to come so I can test this bag. I'll update my review when I do.

downtek down in action!

Posted on

check this short vid out that demonstrates DownTek's water repellent properties. You will want this bag after watching...

5 5

Buffalo River Camp Orr

We drove in at dusk set up our tent. My son and I both have self inflating ground pads and 20 degree or better sleeping bags. I have the Big Agnes Bellyache. The first night was perfect, around 50 degrees or so, and the next two nights were about 75 degrees it seemed. The Big Agnes allowed me to sleep comfortably in my bag. I used my night clothing to regulate my temperature so I didn't over heat. The bag stayed dry even in the humid conditions we were in. I was well pleased.