Lark UL 10

Take our most popular 20 degree model, add a full collar and additional fill and you have a solid 3-season bag that still packs smaller and lighter than most bags with a warmer rating. The Lark represents an excellent option for those that tend to sleep on the cold side.

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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


Temperature Rating 10ºF / -12.2ºC
Dimensions 60" / 56" / 38"
Length Reg: 6' 0" / 183 cm
Long 6' 6" / 198 cm
Sleeping Bag Shell Fabric Pertex® Endurance UL
Lining Fabric Flite 15 denier ripstop nylon
Fill Power 900+ Goose Down
Fill Weight Reg 20 oz / 567 g
Long 21.2 oz / 601 g
Average Weight Reg 2 lb 0 oz / 913 g
Long 2 lb 2 oz / 971 g
Packed Size 7" x 14" | 11L
Zip Side Left
Country of Origin Manufactured in the USA from imported materials
Standard Mummy Sleeping Bag Sizing

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Reviewing: Lark UL 10

Customer Reviews

  1. Lark LT - very warm and comfy

    by Jay on Apr 15, 2014

    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.

    by Guest on Aug 20, 2013

    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.
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