Marmot Phase 20 Ultralight Sleeping Bag Arctic Navy/Mykonos Blue Sale


Marmot Phase 20 Ultralight Sleeping Bag Outdoor Gear Lab Top Pick Award Marmot Phase 20 Ultralight Sleeping Bag Arctic Navy/Mykonos Blue Marmot Phase 20 Ultralight Sleeping Bag Arctic Navy/Mykonos Blue unzipped and open

Marmot Phase 20 -7°C Ultralight 850 Fill Power Down Sleeping Bag - Regular Length


$400.00 $466.00

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The Marmot Phase 20 Ultralight Sleeping Bag is the ultimate dream factory creating easy sleep even in frosty temps. Marmot constructed this feature-rich bag with ultra lightweight Pertex Quantum® GL fabric and filled it with water-resistant 850-fill-power down in a baffled construction, which reduces cold spots.


  • Anatomical wrap-around footbox increases insulation and room for your feet, more warmth and comfort
  • Smooth-curved baffles reduce down shifting. Nautilus multi-baffle hood limits heat loss
  • Full length (down to footbox) locking YKK two way zipper with anti-snag slider reduces fabric snagging
  • Filled and finished in Rohnert Park, California
  • Certified 850 fill power down with down defender to improve water-resistance in wet conditions
  • EN Tested for accurate sleeping temp range
  • Internal stash pocket
  • Snagless insulated draft tube
  • Hood draw cord
  • Stuff and storage sack included
  • Zipper garage
  • Stretch tricot baffles
  • Two hang loops


Main Materials: Pertex 10d 100% Nylon Ripstop .88oz/yd
Lining Material: Pertex 10d 100% Nylon Ripstop .88oz/yd
Insulation Material: 850+ Fill Power Goose Down
Sleeping Bag Weight: 1lbs 7.3oz (660g)
Bag Temperature: 20° F/-6.67° C
EN Rating: Comfort: 29.5°F / -1.4°C | Lower Limit: 18.5°F / -7.5°C | Extreme: -13.7°F / -25.4°C
Interior Length: 80in (203cm)
Bag Dimensions: (Shoulder X Hip X Foot); 60in (152.4cm) x 58in (147.3cm) x 45in (114.3cm)
Bag Zipper Position: LZ 

Outdoor Gear Lab Top Pick Award

"The new Marmot Phase is exceptionally light for its temperature rating. It's a fantastic all-around bag with almost no negatives. Despite its low weight, its dimensions still strike a nice balance between comfort and thermal efficiency (not being too loose and thus cold) and overall, we found the Phase to be warmer than most other similarly rated bags. The internal fabric is wonderful and silky feeling against our skin and its full-length zipper, coupled with its low weight, make it one of the most versatile bags in our review.

While it's a great all-around 20F model, it's not the warmest. That nomination is earned by the roasty-toasty Western Mountaineering UltraLite. For pushing your backpacking sleeping bag to truly frigid temps, we prefer the UltraLite, but otherwise, we prefer the lighter weight of the Phase 20."

Outdoor Gear Lab, 2018


Marmot Down Defender
Highly water-resistant down treatment that we've taken from apparel into our sleeping bag collection. Marmot Down Defender helps prevent down from clumping and losing its loft when exposed to water, thereby greatly increasing its ability to keep you warm and comfortable. We've chosen to use Marmot Down Defender in our Kids, Snowsports, and City collections.
  • Stays drier 10 times longer than untreated
  • Down maintains 150% more loft than untreated down in damp conditions
  • Dries 30% faster than untreated down
  • Treatment is PFOA and PFOS free Bluesign approved

    Down: From the beginning, down has been Marmot’s foremost insulator. No synthetic surpasses the lightweight, compactability and longevity of down. Marmot Down DNA: Down is in our DNA. Marmot was founded in 1974 as a manufacturer and seller of premium quality down jackets, vests and sleeping bags. To this day we only use the finest quality certified goose down for our down insulated outdoor products. Mountaineers and outdoor enthusiasts worldwide rely on Marmot down gear for warmth, comfort, and sometimes survival.
    Marmot Down Quality: Down quality is determined by fill power and durability which is dependent upon the age/maturity of the bird and the processing of the down. The best down comes from larger, more mature birds and goose down is better than duck down (when age/maturity are equal). More mature goose down has larger filament clusters than less mature goose down. These clusters, when grouped, provide many more trapped air pockets and therefore provide better insulation. To maximize the effectiveness of the down clusters, the proper processing of the down (sorting, washing & drying) is required to open them up. Higher fill power means higher loft, better insulation, lighter weight, and greater durability. We test all of our down for content, cleanliness, species, and fill power. We guarantee minimum fill power for all of our down clothing and sleeping bags. That means, for example, that our 800 fill sleeping bags are guaranteed to have at minimum 800 fill power. We don’t believe in + or – variation when it comes to comfort. Down Origins: Down is the light, fluffy undercoating at the base of the feathers of waterfowl. Down is a multi-dimensional structure that insulates by creating pockets of still air that retain body heat. Down is highly breathable and exceptionally comfortable. Pound for pound, high quality down is the most efficient natural insulator there is. Geese are raised primarily for food and the down that is derived from them is a by-product of the food industry. Geese are raised on large and small farms and roam free outside on these farms. This is their natural environment. They are not raised indoors in controlled conditions. Geese are grain fed and also have access to local plant life. Geese are generally harvested after 4-9 months for food. Some female geese are kept for breeding stock and are harvested between 1-2 years. These are the geese called the “mother birds” that provide the best, most mature down. After the geese have been harvested for food, the down and feathers are removed, washed, dried and then sorted by separating the down and small feathers from the larger, heavier feathers. These processing methods determine the final quality and fill power of the down. Marmot currently buys down primarily from Russia, Poland & China.

    Customer Reviews

    Based on 1 review
    melissa f. (Sydney, AU)
    Fantastic Sleeping Bag

    This sleeping bag is very warm. I am unsure how cold it was in the blue mountains but it was cold. The hood on the bag is amazing. It is just your eyes and nose left poking out and the hood moves with you. The zipper and toggles glow faintly in the dark which I didn’t know but thought was excellent because when I woke in the night I could find them easily. The pocket inside the bag is a good size.
    I bought a sea to summit waterproof compression sack for putting the sleeping bag in for hiking. This worked really well. I didn’t know which one to buy so I called Tim and he sorted it all out for me. Tim was super helpful and also organised the best postage for my rural area.
    The sleeping bag also comes with a large size storage bag to keep condition at home and a smaller stuff sack - which just wasn’t going to be small enough for my 40L multi day hiking pack and that is why I wanted the compression sack.
    Couldn’t be happier with the products I received! And the service was exceptional.
    Thanks Tim!

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