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Like a knife built by the Swiss, the Big Agnes Heart Mountain SL Sleeping Bag is packed full of versatility designed specifically for long treks into the wilderness. A water-resistant and lightweight Pertex shell is super soft and packs down small, toasty goose down keeps you warm while you slumber, and an integrated sleeve locks your sleeping pad to your bag so you can roll off your bedding. Slide into this spacious rectangular bag and slumber soundly Spring through Fall.

  • Big Agnes bags don't have ground insulation and are meant to be used with a sleeping pad (not included) to be completely insulated
  • Full-pad sleeve holds any 20-inch-wide sleeping pad and prevents you from rolling off your pad while sleeping
  • Pertex Quantum shell fabric is durable but soft, highly packable, and features a water-repellent coating
  • Soft, breathable, and down-proof lining feels great against your skin and features a stain-resistant finish in case the blister on your heel pops overnight
  • High-quality, 800-fill down insulation features a super high warmth-to-weight ratio to save your shoulders during long days on trail
  • Flow insulation system with a unique baffle design distributes heat evenly through the bag to help eliminate cold spots, eliminate bulk, and keep weight down
  • Vertical Thermal channels enhance uniform distribution of heat over the entire length of the bag for greater warmth and fit
  • Semi-rectangular shape gives you more room to stretch out your tired legs
  • An insulated draft collar around your head and a draft tube covering the zipper provide extra protection to keep you toasty despite the cold
  • Interior fabric loops help hold in sleeping bag liners should you need some extra heat
  • Zip the Heart together with another Big Agnes sleeping bag with the same YKK #8 zipper size
  • Note: sleeping pad not included
  • Reviews
  • Q & A

What do you think about this product?

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Great Bag

  • Familiarity: I've put it through the wringer

I took this bag on the Tour Divide this year and it served me well. Had it below 30 degrees on a couple nights and it performed better than i thought even outside of the range. Overall a grweat bag that is very light and packs down fairly small.

Love this bag

  • Familiarity: I've used it several times

Got this out for 4 days this past month and I'm thrilled with it. I upgraded from a 6 y/o Marmot Sawtooth so I'm basing my comparisons on that.

1. Its crazy light, and packs down pretty small. not 40F bag small, but small for a 30F bag

2. I love that with the bottom pad sleeve I get a boxer shape and the inability to roll off the bag for the same weight of a narrower bag with insulation on both sides

3. Big Agnes did a nice job of insulating the area around the zipper. The zipper is an inch above the seam with the sleeping pad sleeve and there is a draft tube that lays over the zipper and overlaps some with the insulation at the seam. Works to prevent the cold zone I've experienced over there.

a gripe:

the shell material is really thin; its held up to being stuck in the zipper a bunch of times, but might be a poor choice if you are hard on gear. I suspect anything in the Super Light category is the same.