The North Face Aleutian 20 Sleeping Bag

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The synthetic Aleutian 20 Sleeping Bag from The North Face is cut to be roomy and unzips flat for excellent comfort on your mountain explorations throughout spring, summer and fall.

  • Features

    • With a European Norm (EN) lower-limit rating of 15°F, the Aleutian 20 is a versatile bag for 3-season backpacking adventures when temps might dip below freezing
    • Heatseeker™ Eco insulation offers a great warmth-to-weight ratio, is highly compressible and extremely durable; made with 30% post-consumer recycled material
    • Full-length zipper wraps all the way around the footbox so you can unzip and use the sleeping bag as a blanket
    • Unzip the short zipper opposite the full-length zipper so you can fold the front of the sleeping bag down like you would with a comforter at home
    • Roomy, comfort-oriented cut gives you ample space to move around
    • Full-length draft tube backing the zipper keeps the warmth in and the cold out; draft collar limits heat loss
    • Vaulted footbox allows natural foot movement and eliminates excess lateral space, increasing thermal efficiency to keep your feet warm and comfortable
    • European Norm (EN) is an independent third-party temperature rating, allowing accurate comparisons across brands with other EN-rated bags


    Many sleeping bags are rated for temperature by an independent testing protocol. REI and the broader industry now use the International Organization for Standardization (ISO) 23537 protocol, which improves on the older European Norm (EN) 13537 standard; you may still see older items in our assortment that were only EN tested. With either protocol, each bag gets a Comfort (or T-Comfort) rating and Lower Limit (or T-Limit) rating. The Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Ratings are based on a person wearing one long underwear layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38. Many brands use the Comfort rating for women's bags and the Lower Limit rating for men's and unisex bags. Everyone's body and sleep comfort differ, and conditions of use (posture, clothing, sleeping pad R-value, wind, humidity, etc.) affect total insulation, so EN and ISO ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth.
    View all The North Face Men's Sleeping Bags
  • Technical Specs

    Best Use



    Tested Lower Limit

    15 degrees (F) - EN

    Tested Comfort

    30 degrees (F) - EN

    Temperature Rating (F)

    20 degrees (F)

    Temperature Rating (C)

    -7 degrees (C)



    Zipper Location


    Insulation Type



    Heatseeker Eco synthetic



    Sleeping Bag Shape


    Compressed Volume

    11.3 liters



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