Big Agnes Greystone 20 Sleeping Bag - Men's

Color: Red
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Ideal for backpacking but versatile enough for couch surfing, the men's Big Agnes Greystone 20 sleeping bag is insulated with DownTek™ down and uses a baffle construction for superb warmth.


  • 600-fill-power DownTek down repels water while maintaining its insulating value
  • Shell and lining fabrics feature a PFC-free water-repellent finish
  • Traditional mummy shape allows for a light weight and increased thermal value
  • Contoured hood follows the shape of your head for a more comfortable fit
  • Low-profile cordlock lets you uncinch the hood with one hand
  • Insulated tube along upper hood opening, oversize interior anti-draft collar and no-draft zipper garage work together to seal out drafts
  • Anti-snag zipper enables a smooth, quick zip; 2-way zipper
  • Includes liner loops for attaching a sleeping bag liner (not included)
  • Mate together left and right zip bags
  • Exterior loops let you hang the bag up to dry or for storage
  • Includes a storage sack and stuff sack


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 Big Agnes Backpacking Sleeping Bags

Technical Specs

Best Use


Tested Lower Limit

16 degrees (F) - ISO

Tested Comfort

28 degrees (F) - ISO

Temperature Rating (F)

16 degrees (F)

Temperature Rating (C)

-9 degrees (C)


Regular - Left Zip: 2 lbs. 4 oz.

Long - Left Zip: 2 lbs. 7 oz.


Recycled 20-denier 400T polyester ripstop with PFAS-free water-repellent finish

Zipper Location


Insulation Type


Water-Resistant Down



600-fill-power DownTek down

Fill Weight

Regular - Left Zip: 1 lb. 3 oz.

Long - Left Zip: 1 lb. 5 oz.


Recycled polyester taffeta with PFAS-free water-repellent finish

Sleeping Bag Shape


Fits Up To (in.)

Regular - Left Zip: 72 inches

Long - Left Zip: 78 inches

Shoulder Girth (in.)

Regular - Left Zip: 60 inches

Long - Left Zip: 63 inches

Hip Girth (in.)

Regular - Left Zip: 54 inches

Long - Left Zip: 57 inches

Stuff Sack Size

9 x 20 inches

Stuff Sack Volume

20.8 liters

Compressed Volume

Regular - Left Zip: 8 liters

Long - Left Zip: 9.3 liters




Contains recycled materials

Down certified to the Responsible Down Standard (RDS)

1 reviews with an average rating of 4.0 out of 5 stars

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