Lark 10 UL Sleeping Bag
Lark 10 UL Sleeping Bag

Lark 10 UL Sleeping Bag

Regular price Sale price$679.00
33 Reviews


Due to high demand, Feathered Friends sleeping bags may take 5 to 9 days to complete. Please view our Shipping information here.

Once we receive your order, we will finish hand-crafting your sleeping bag right here in Seattle!

If you have an urgent deadline, do not hesitate to contact us.

Please check our Shipping Info page for current shipping times. Thanks!

We made a favorite even warmer. Take our most popular 20 degree model, the Swallow, add a full collar and additional fill, and you have a rock-solid three-season bag that packs remarkably small while maintaining room to sleep comfortably. The Lark represents an excellent option for those who sleep on the cold side or push their adventures well into the colder evenings of spring and fall.

UL: Ultralight. Pertex® Endurance® 10 denier water-resistant/breathable fabric.


  • Mummy shape (average width) with #5 YKK two-way, separating zipper with locking sliders
  • Full collar provides an effective seal of down around your neck to trap the heat
  • Trapezoidal footbox allows your feet to fall in a natural pose without compressing the sides
  • Continuous baffles let you position the insulation where you need it
  • 3D contoured hood opens wide for warm nights and cinches tight when the temps start to drop
  • Generous draft tube prevents cold air from seeping past the zipper
  • Includes storage bag & stuff sack


Mummy Sleeping Bags

Feathered Friends standard-width mummy sleeping bags are ideal for most people - a balance of space without too much excess.

Regular Length
Fits up to 6' 0" | 183 cm

Long Length
Fits up to 6' 6" | 198 cm

Have questions on sizing? Feel free to Contact Us - We're happy to help!

Additional Info

Ideal Sleeper Height Reg 6' 0" / 183 cm 
Long 6' 6" / 198 cm
Dimensions 60" shoulder / 56" hip / 38" footbox
Zipper Left Side, YKK #5
Shell Pertex® Endurance UL
Lining Flite 15 denier ripstop nylon
Fill Power 950+ Goose Down
Origin Made in Seattle, USA of imported materials
Temp Rating 10ºF / -12.2ºC
Fill Weight Reg 1 lb 4 oz / 568 g 
Long 1 lb 5.2 oz / 602 g
Average Weight Reg 1 lb 15.3 oz / 887 g 
Long 2 lb 1.1 oz / 938 g
Packed Size 11L


Customer Reviews
5.0 Based on 33 Reviews
5 ★
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Filter Reviews:
Gustaaf v.
United States United States

First impressions

Used it one night at 11,600 ft with outside temperatures dipping to 40F. As expected, the bag kept me toasty warm. What impressed me that even at temperatures well above its rating the bag remained comfortable. Will have to wait until later in the season to judge its performance at lower temperatures

  • How would you rate the quality? Not greatExcellent
  • How is the warmth? Not WarmExtremely Warm
  • How is the fit of the sleeping bag? Runs SnugVery Roomy
Kathan H.
United States United States

Excellent Bag

High quality sleeping bag with excellent warmth to weight ratio. Buought the bag to use in the lower 20s and have been kept warm the few nights that I have used it already. This bag is definitely comfort rated to 10° and I added 2 ounces of overfill for extra warmth. Feathered friends was very easy to work with and I am extremely happy with this bag! Quite expensive but worth the investment 100%! Would recommend to anyone!

United States United States

Amazing Bag

Could not be more happy or impressed with this bag

  • How is the fit of the sleeping bag? Runs SnugVery Roomy
  • How is the warmth? Not WarmExtremely Warm
  • How would you rate the quality? Not greatExcellent
Will B.

Light+Warmth+Quality=Very Happy

Steven P.

Excellent bag for sure, way more comfortable than my 37 year old down bag. We had an unseasonably cold snap on our AT journey and it kept me toasty at 24 degrees with a 35 mph wind under a tarp. Really like the baffles around neck. Love it. Thanks