Big Agnes Mirror Lake 20

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More Information
Insulation Down
Comfort temperature -10° / 0°
Weight 1000 - 1250g

Quick overview

The Big Agnes Mirror Lake 20 is a women's specific mummy sleeping bag. Big Agnes have filled it with more down than used in their bigger Spike Lake unisex bag, and the shape and sizing are adapted to the female anatomy. Meaning you ladies get a very well insulating and comfortable sleeping bag with extra down in areas where you need it, like the footbox and hip.

Big Agnes traditional down mummy bags deliver high value and performance in a lightweight bag. Ideal for backpacking but versatile enough for couch surfing, they are insulated with DownTek™ and use baffle construction for efficient heat distribution. 

If you’re in the market for a women's specific mummy shaped bag constructed with high quality, lightweight materials the Big Agnes Mirror Lake 20 is your ticket to traveling fast and light.


Big Agnes Mirror Lake 20 Small/ Petite Women's Regular
Comfort °C -5 °C -5 °C
Limit °C -12 °C -12 °C
Extreme °C -32 °C -32 °C
Fill weight (grams) 620 650
Weight (kg) 1.08 1.13
Insulation material 600 fill DownTek™ 
Up to bodysize <165 cm <178 cm
Shoulder- / Hip- / Footwidth (cm) 137 - 137 - 86 cm 142 - 142 - 91 cm
Compressed Size 20x23 cm  20x25 cm
Shape Mummy Mummy
Zip Right Right 
Intended use Lightweight trekking


  • Small/ Petite: fits up to 5'5" / 165cm
  • Regular: fits up to 5'10" / 178cm
  • Works with any pad size or style


  • Big Agnes' traditional down mummy bags deliver technical, lightweight performance to excel on and off the trail with high thermal value, compressibility, and comfort wherever you go
  • Big Agnes' Women’s mummy bags have a combination of increased insulation, as well as a fit that is shaped to contour to a woman’s body, creating an efficient sleeping bag for women, and ultimately a better night’s sleep.
  • Traditional mummy shape allows for lightweight and increased thermal value
  • Contoured hood follows the shape of your head for a more comfortable fit
  • Oversized interior anti-draft collar
  • Low-profile cordlock lets you un-cinch the hood with one hand
  • Breathable shell fabric with a water-repellent finish
  • Anti-snag zipper for a smooth, quick zip
  • 55"/140cm YKK #5 anti - snag locking zipper - small/ petite bags
  • 65"/165cm YKK #5 anti - snag locking zipper - regular bags
  • Two-way zipper
  • Zipper Garage
  • Liner loops
  • Mate together left and right-zip bags
  • Mesh storage sack & nylon stuff sack
  • No-draft collar and no-draft zipper
  • Exterior loops for hang drying or storage