Marmot Womens Phase 20 Down Sleeping Bag

-12.5°C Comfort Limit (EN13537:2012), 520g of 850 Fill Power Down (US Method)
Weighs 782g (excluding bag)
Code: SS17606
  • Now £439.99
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The Marmot Phase 20 is an ultralight mummy style sleeping bag designed for women featuring 850+ fill power hydrophobic down, a full length zipper, lots of loft helped by the Pertex Quantum GL shell fabric plus a well designed and very effective hood.

Marmot says:

We built this bag with a tranquilizing effect, a.k.a. gobs and gobs of down. The 850-fill-power down is stuffed into an ultra lightweight and water-resistant fabric and accented with a plethora of technical features, making the Women's Phase 20 one of our warmest bags yet.


The Marmot Phase 20 is an ultralight mummy style sleeping bag featuring 850+ fill power down (RDS certified and treated with PFC free Down Defender to improve water resistance), a full length zipper, a well designed, effective hood and lots of loft helped by the Pertex Quantum GL shell fabric.

Marmot have taken the Marmot Phase 20 and tailored it for ladies with a ladies size and fit plus lots more down. Marmot have added an extra 30% down into into key areas to make the bag suitable for ladies down to -7 degrees C.

If you are looking for a seriously light 3 season down sleeping bag with a small pack size then the Marmot Phase 30 certainly tick the boxes. Marmot's use of ripstop Pertex Quantum GL fabric, which is one of the lightest available, allows the down to loft with ease whilst helping the bag to compress to a tiny pack size of under 6.5 litres with it's included stuff sack. With a compression bag you'd get it even smaller which is amazing for a bag rated to this temperature.

The Phase sleeping bags don't have neck baffles but they do have one of the best designed hoods we've tried which really helps to keep you felling toasty on a cold night.

The Phase 20 uses Marmot's hydrophobic Down Defender to help the down to stay dry for longer, loft better when damp and dry faster than standard untreated down.

- Reviewed by Ultralight Outdoor Gear

Help and advice:Choosing a sleeping bag advice
 EN 13537 rating for sleeping bags explained
 Sleeping bag shape and sizes advice
 Sleeping Bag features Page 1
 Sleepin bag features page 2
 All about down filling in sleeping bags
  • Women's specific fit - more insulation in key areas
  • 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 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
  • Internal stash pocket
  • Snagless insulated draft tube
  • Hood drawcord
  • Stuff and storage sack included
  • Weight: 782g (excludes storage bags)
  • Fill weight: 520g
  • Fit range: 5,6"
  • Interior length: 190cm
  • Shoulder: 147.3cm
  • Hip: 147.3cm
  • Foot: 110cm
  • Stuff sack: 19 x 40.5cm
  • Stuff sack volume: 11.6L

EN Rating

  • EN Rating Comfort limit: 21.7°F / -5.7°C
  • EN Rating Lower comfort limit: 9.5°F / -12.5°C
  • EN Rating Extreme limit: -25.6°F / -32.0°C


  • Shell: Pertex Quantum 10d 100% Nylon Ripstop .88oz/yd
  • Lining: Pertex Quantum 10d 100% Nylon Ripstop .88oz/yd
  • Insulation: 850FP Goose Down, PFC-Free Down Defender
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