Free Shipping on Orders $89+ With Code: SHIP89. See Details.

Marmot 20°F Flathead Down Sleeping Bag - Long Mummy, 600 Fill Power

Item #3046W
$230.95 Save 20% Compare at $289.00
We apologize for the inconvenience! This product is currently sold out!
This feature is only available for colors and sizes not currently in-stock


About Marmot 20°F Flathead Down Sleeping Bag - Long Mummy, 600 Fill Power

Closeouts.Marmot's 20°F Flathead down sleeping bag is the perfect lightweight solution for cool backcountry nights. It uses light and lofty 600 fill power goose down and has a drawstring hood with head gasket that helps trap body heat when temperatures dip..


Specs about Marmot 20°F Flathead Down Sleeping Bag - Long Mummy, 600 Fill Power

  • Insulation material: Goose down
  • Insulation fill power: 600
  • Fill weight: 22oz
  • Shell material: Nylon
  • Lining material: Polyester
  • Girth (shoulder/hip/foot): 66/62/41"
  • Fits to: 6'6"
  • Length: 93"
  • Stuff size: 14x7-1/2"
  • Zipper: Left
  • Stuff sack: Yes
  • Storage sack: Yes
  • Weight: 2 lb. 10 oz.
  • Recommended use: Backpacking
  • Made in China
  • Visit our Sleeping Bag Guide
  • Cannot ship to Australia
  • Cannot ship to New Zealand


Do you own this product? Write a review and help others with their buying decisions!

4.258064 5 Overall Rating: 4.3 Based on 31 reviews

Most Helpful 5-Star Review

Verified Buyer Reviewed by ibenick from Salt Lake City, UT on Wednesday, May 4, 2011
I'm a big guy, 6'4" and close to 300lbs. It's tough to find a bag with enough room for me and while this isn't the roomiest bag I own, it fits great. I just spent 5 nights with it in The Maze district of Canyonlands. Several of the nights were bitter cold and windy and this bag kept me toasty warm, ... Read More
Your search for "" returned reviews for Marmot-20-F-Flathead-Down-Sleeping-Bag-Long-Mummy-600-Fill-Power Remove reviews search
  • Reviewed by Ricky from Ohio on Thursday, March 13, 2014
    This was my first down bag, and being pretty much the cheapest you could buy, I went for it expecting a good starter bag. Boy was I surprised This with my thermarest neoair mattress can go down to some low temps. I really like how the bag feels with the down insulation its hard to explain but just being inside it seems peaceful and relaxing. It doesn't come with a compression sack but in all honesty I didn't know bags did, So I ordered one with it.
    A great bag if your looking to upgrade to the world of down bags, or just looking for a light 3 season bag this is definitely the one.

    Note I am 6' 2" and I have "so much room for activities" in this bag
  • Reviewed by DR from CO on Saturday, February 15, 2014
    Got this expecting a compression sack--details do indicate that is only comes with a simple sack which is worthless for backpacking--oh well. Other than that bag is good, warm and not exceptionally light.
  • Reviewed by Dadburnet from Chicage on Thursday, February 13, 2014
    Even in the long version it is narrow in the shoulders. Not quite to it's rated temperature either. Reasonably light and well made . For a low price it is still a good bag,just watch the shoulder is cut narrow.
  • Reviewed by Mejensen from Sebastopol on Saturday, February 1, 2014
    Solid, warm bag, and light weight! Perfect for any 3-season trip.
  • Reviewed by The Snowboarder from Baltimore, MD on Tuesday, January 21, 2014
    This is an excellent lightweight sleeping bag for backpacking and camping. I purchased this for a 5 day backpacking trip in the High Sierra in August and it performed excellently (temps in the 30's there). I've used this bag down to 20 degrees (maybe even upper teens) and it was still warm enough with a base layer and fleece layer. That is its limit though.

    I highly recommend this bag.

Question & Answer

Questions about this product? Get answers from community and staff experts.

  • “What size is the zipper on this bag? Would it be compatible to be zipped together with an REI brand sleeping bag?”
    Asked by M from UT on 12/13/2013 11:36:29 AM
    • Mummy bags are not designed to be zipped together.
      Answered on 12/13/2013 11:44:27 AM by Product Specialist Greg from Sierra Trading Post
  • “Does this bag have any water resistant quality to it?”
    Asked by Vespasian from Boston on 7/7/2011 12:00:00 AM
    • This bag does not have any water resistance treatment.
      Answered on 7/18/2011 12:00:00 AM by Customer Care from Sierra Trading Post
  • “Does this sleeping bag have a down-filled collar?”
    Asked by Anonymous from SLC, UT on 6/8/2011 12:00:00 AM
    • Yes, the entire bag is down filled.
      Answered on 6/14/2011 12:00:00 AM by Anonymous from Unknown
  • “What is the production year for this sleeping bag?”
    Asked by Anonymous from SLC, UT on 6/8/2011 12:00:00 AM
    • This is from 2010.
      Answered on 6/13/2011 12:00:00 AM by Customer Care from Sierra Trading Post
  • “Does the zipper on this bag warp all the way around the footbox? Can this bag be unfolded completely flat?”
    Asked by Anonymous from Unknown on 6/6/2011 12:00:00 AM
    • It has a three quarter length double zipper.
      Answered on 6/13/2011 12:00:00 AM by Anonymous from Unknown

About Marmot

Conceived in a university dorm room by a pair of climbing buddies, Marmot Mountain Works first opened its doors in the spring of 1974 in Grand Junction, Colorado. At the time, the base of operations was a 100-year-old stone building. That same year, the first Marmot down jacket was produced specifically for an action flick called “The Eiger Sanction,” starring legendary actor Clint Eastwood. In the four decades since, Marmot has continued to engineer reliable gear that exceeds the expectations of outdoor athletes. Today, Marmot tents, backpacks, outerwear, clothing and Marmot sleeping bags are still pushing the limits in the planet’s most challenging conditions, from the summits of the world’s highest mountains to the deepest river basins.