Lark 10 UL Sleeping Bag

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.

Availability: Select color & length for availability

Availability Information

From: $579.00

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  • 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
  • Overlapping dual-webbing zip guard guides the fabric away from the zipper and eliminates the need for a stiff or heavy fabric layer that can interfere with the draft tube seal
  • 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

Length Reg 6' 0" / 183 cm | Long 6' 6" / 198 cm
Dimensions 60" / 56" / 38"
Fill Power 950+ Goose Down
Fill Weight Reg 20 oz / 567 g
Long 21.2 oz / 601 g
Lining Fabric Flite 15 denier ripstop nylon
Country of Origin Made in Seattle, USA of imported materials
Packed Size 11L
Average Weight Reg 31.3 oz / 887 g
Long 33.1 oz / 938 g
Sleeping Bag Shell Fabric Pertex® Endurance UL
Temperature Rating 10ºF / -12.2ºC
Zip Side Left

Customer Reviews (6)

WOW, nicest piece of gear I own Review by will
I haven't spent many nights in my new Lark yet, but wow. This bag just reeks quality. I can't believe how fluffy the 950 fill down is, and the bag packs down nicely for how warm it is!! I plan to just use this bag for all of my 3+ season use. It'll be a little warm in summer, but I can't bring myself to use one of my other bags after getting this work of art. (Posted on 2/14/2019)
Best Bag!!Review by Rebecca
I have used this bag in way colder than the rating. It still kept me warm! Super high quality, plenty of room. Absolutely my favorite! High recommend this bag and this company. (Posted on 5/27/2017)
Really Really Nice Sleeping BagReview by Kipp
I received the bag two weeks ago, stuffed it in a dry compression sack and went on a 5 day winter kayak tour on Lake Powell. In the compression sack, the bag slips easily into a 13 liter Big River dry sack. Upon setting up camp, the bag fluffed quickly into its fully lofted form, begging for a nap. Nights were low 20 degrees Fahrenheit and I never fully zipped the bag and was warm and toasty. Finally, it rained and snowed every day and night and at the end of the trip, the Lark was still fully lofted, dry and warm. I definitely recommend this bag! (Posted on 1/25/2017)
Wow, is this bag warm!Review by Joe B
I just bought this bag in early October. I'm amazed at the quality of the construction, the luxurious, light fabrics, and the amount of loft from the 20 ounces of down! The bag (size Regular) is roomy and long for my 5' 10", 150 lbs. It has a huge down collar and zipper draft tube. It weighs one ounce less than it's supposed to and lofts up almost stiffly, the down has so much loft!. I have no doubt that with some sleeping clothing layers, this bag would be good to 0° F and below. (Posted on 10/25/2016)
Lark LT - very warm and comfyReview by Jay
I just got the bag. They did a great job working with me on finding the best bag and materials. And the bag was so comfortable while camping out on a chilly night in the Idaho desert. This bag replaces my other Feathered Friends Swallow bag that I've had for 22 years. I'm looking forward to 22 more years with the LarkLT and I don't think I'll be disappointed. (Posted on 4/15/2014)
This is the best bag I've had in all my 50 years of backpacking. It's light, warm at low temps and even into the moderate highs of summer. The Pertex Endurance shell fabric sheds water like a duck, and the dark colors help this bag to absorb heat and conceal the inevitable stains and dirt. The Lark UL has become my goto bag for every outdoor adventure.
(Posted on 8/20/2013)

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