Marmot  Ollan 20 Sleeping Bag - Men's Long

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Made with a super warm combo of natural wool and bio-based synthetic insulation for cold nights out, the men's Marmot Ollan 20 long sleeping bag has a roomy shape for extra comfort.


  • Pertex bio-based fabric is made from castor beans
  • Wool/polyester insulation with shingled construction on top; recycled HL-ElixR™ Eco insulation on bottom
  • Full-length, locking YKK 2-way zipper with antisnag slider
  • ISO-tested for a reliable temperature rating
  • Lightweight for easy packing
  • Closeout


Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.

Each bag then gets 2 ratings: 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. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
View all Marmot Backpacking Sleeping Bags

Technical Specs

Item #223992
Best Use


Tested Lower Limit

19 degrees (F) - ISO

Tested Comfort

30 degrees (F) - ISO

Temperature Rating (F)

20 degrees (F)

Temperature Rating (C)

-7 degrees (C)


3 lbs. 9.5 oz.


Nylon ripstop

Zipper Location


Insulation Type



Polyester/wool/HL-ElixR Eco

Fill Weight

2 lbs. 10.7 oz.


Nylon ripstop

Sleeping Bag Shape


Fits Up To (in.)

78 inches

Shoulder Girth (in.)

65 inches

Hip Girth (in.)

60.6 inches

Stuff Sack Size

11 x 23.2 inches

Stuff Sack Volume

36.3 liters



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