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Marmot Phase 30 -1°C Ultralight 850 Fill Power Down Sleeping Bag - Regular Length


Sale price $529.95 Regular price $599.95

Tax included.
Sleep comfortably on colder overnight camping trips without adding bulk to your pack with the Marmot Phase 30° F 850 Loft Down Ultralight Sleeping Bag. You'll stay warm and dry, thanks to the lofty 850-fill-power-down insulation and water-resistant Down Defender treatment. Stretch tricot baffles help keep the fill in place while the adjustable drawcord hood cinches close and the roomy footbox offers extra comfort. Tuck small items into the internal stash pocket for easy access during the night. When it's time to head home, stuff the sleeping bag into the included storage sack. Filled and finished in Rohnert Park, California.


  • Anatomical wrap-around footbox increases insulation and room for your feet, adding more warmth and comfort
  • Smooth-curved baffles reduce down shifting. Nautilus multi-baffle hood limits heat loss
  • Full length 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 sleeping bag
  • Internal stash pocket
  • Snagless 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 1.6oz (500g)
Bag Temperature: 30° F/-1° C
EN Rating: Comfort: 42°F / 5.6°C | Lower Limit: 33°F / 0.6°C | Extreme: 5.4°F / -14.8°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
Bag Volume: 2.99 Litres 
Stuff Sack: 15.2 x 33.5 cm (can go smaller compressed)
Colour: Deep Teal/Turf Green

Outdoor Gear Lab Top Pick Award, Ultralight Sleeping Bags

"The Marmot Phase 30 is a fully hooded mummy bag that is comfortable, more versatile than most fully hooded ultra-light mummies due to its nearly full-length zipper, and is lightweight. While it wasn't the highest scorer in our review, it was pretty close. We chose to recognize it as our Top Pick for Weather Resistance due to its combination of naturally water-resistant Pertex Quantum material, combined with DWR treated 850-fill power down. While this doesn't mean that this bag could get soaked through and still provides the same amount of insulating loft as synthetic material, it does mean that it is better suited than most down bags we tested to handle wetter climates (given that you still take every precaution to keep it dry and air it out whenever possible). While we managed to find a few minor flaws, we think this is a quality ultralight bag that is worth investigating for those worried about water.."

Outdoor Gear Lab, 2019


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.