Lark 10 YF Sleeping Bag
Lark 10 YF Sleeping Bag

Lark 10 YF Sleeping Bag

Regular price Sale price$579.00
23 Reviews


Please view our Shipping information here for updated shipping times.

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. Filled with premium 900+ fill power goose down, the Lark YF 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.

Our YF line of sleeping bags feature a lightweight, 100% nylon Pertex® Quantum® shell that uses yarns with unique Y-shaped filaments to create a fabric with increased downproofing and water beading properties, even after years of use and washing.

YF: YFuse. Pertex Quantum® 20 denier mini-ripstop fabric treated with a DWR (durable water repellent) finish.


  • 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® YFuse®
Lining 100% Recycled 20 Denier plain weave 37g/m²
Fill Power 900+ 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 2 lb 1 oz / 935 g 
Long 2 lb 3 oz / 992 g
Packed Size 11L


Customer Reviews
4.9 Based on 23 Reviews
5 ★
4 ★
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Customer Photos
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Filter Reviews:
Wes H.
United States United States

Warm, soft, light, and roomy.

  • Fit Runs SnugVery Roomy
  • Warmth Not WarmExtremely Warm
  • How would you rate the quality? Not greatExcellent
Feathered Friends Lark 10 YF Sleeping Bag Review
Sean S.
United States United States

Exceeded expectations, so warm and comfy!

Exceeded expectations, so warm and comfy but not too warm at all. I slept a few nights from 20-45 degrees in CO, and it worked perfectly in those temps and I have no worries about sleeping near 0 degrees with it. Super comfortable and luxurious feeling, and not constricting at all despite my pretty bad claustrophobia. Looking forward to many many more campouts with this lifetime 3 season bag

Glenn F.
United States United States

Great company

Company was great. Bag is great!

United States United States

Cozy and warm

Incredibly comfortable and warm but also surprisingly doesn't get too hot if it is around 40 degrees at night.

Michael P.
United States United States

Warm, roomy and bomber!

Took this up to the boulder field at Long’s Peak, elevation around 12,200 and camped in an open-bottom shelter tent. This bag kept me toasty warm in temps in the mid to high 20’s. The zipper is bomber and doesn’t snag one bit, and the zipper near the foot box was perfect for regulating temps while sleeping. the bag stuffs down very small, to about half the size that the stuff sack provided is. So, get a compression sack and slam more gear into your pack! This is my second FF bag. My other is a Flicker 40 UL. I love them both and am a loyal customer to the brand.

  • 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