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The warmest for the coldest.

This Inferno Sleeping Bag is The North Face's warmest expedition bag and is designed for the world's harshest environments. The North Face treated this bag's light and lofty 800-fill down insulation with ProDown water-resistance to retain its warmth in wet weather. Neovent Air fabric adds extra water-resistance to the hood, back, and footbox for moisture-riddled tents.

A generous mummy cut helps you layer up before you go to bed, and the half-length center zipper offers easy entry. The North Face also added a cinch-cord at the hood and draft tubes at the collar and overlap to keep frigid winds at bay. This bag also features an internal pocket to insulate electronics and valuables.

  • -40F temperature rating
  • 800-fill ProDown insulation
  • Neovent Air hood, back, and footbox
  • Generous mummy cut
  • Half-length center zipper
  • Hood cinch-cord
  • Full draft collar and overlap
  • Internal pocket
  • Compression and storage sacks included

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Here's what others have to say...

Will this be warm enough for climbing Mt Denali?

Best Answer


This -40 bag will definitely be warm enough. If you're a cold sleeper then you'll want to wear additional layers to bed and make sure you eat and drink a bunch / exercise before bed.

Shoot me an email anytime you have questions!

Jared D.

Expert Gearhead


Why do they not list the fill weight... Arghh. Anyone know what it is?


Here is the fill weight for this bag:

Regular: 2lb 12oz

Long: 2lb 15.8oz

Let me know if you've got more questions about this bag or any other gear!

Jared D.

Expert Gearhead



Best Answer

Hey Jim P.

Thanks for your question. The regular bag weighs 3 lbs 14 oz and the long weighs 4 lbs 4 oz.