The most versatile bag on the planet, The North Face One Bag Mummy Sleeping Bag is a clever 3-in-1 sleeping system that features interchangeable layers for 5, 20 or 40°F temperatures. 
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Features:
For mild nights of 40°F or warmer, use the lightweight, synthetic outer layer (blue) on its own
Removable (yellow) mid layer has lightweight, compressible 800 fill-power goose down for warmth down to 5°F
Combine the blue outer and yellow mid layer for a super-warm, 5°F bag that’s suitable for winter camping
Zippers allow easy transitions between the 3 configurations
Outer and inner quilt together: (5°F)
Outer bag without inner quilt: (20°F)
Inner Quilt:  (40°F)
Mid layer also converts to a shawl for added versatility
Bottom layer rolls up into a pillow for maximum comfort
 
Tested Lower Limit
17 / 38 degrees (F) - EN
Tested Comfort
29 / 46 degrees (F) - EN
Temperature Rating (F)
20 degrees (F), 40, 5
Temperature Rating (C)
-7 degrees (C), 5, -15
Weight
Regular - Left Zip: 4 lbs. 10 oz.
Shell
20-denier nylon
Zipper Location
Left/Right
Insulation Type
Down, Synthetic
Water-Resistant Down
Yes
Fill
800-fill goose down
Lining
20-denier nylon
Sleeping Bag Shape
Mummy
Fits Up To (in.)
Regular - Left Zip: 78 inches
Shoulder Girth (in.)
Regular - Left Zip: 61 inches
Hip Girth (in.)
Regular - Left Zip: 57 inches
Stuff Sack Size
10" x 14"