Hummingbird UL 20 Sleeping Bag

When every gram counts and warmth can’t be compromised the Hummingbird is the versatile bag of choice. With the slimmest cut in our lineup, the Hummingbird leaves no room to spare; perfect for going fast and light. The Pertex® Endurance® variation is our lightest 20 degree bag ever.

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

Availability: Select Color & Length for Availability

Availability Information

From: $509.00

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  • Mummy shape (narrow) with #5 YKK two-way, separating zipper with locking sliders
  • Passive collar provides an extra cushion 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 narrower mummy sleeping bags are ideal for those looking for the lowest bulk and weight, or those with thinner builds

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 58" / 52 "/ 38"
Fill Power 950+ Goose Down
Fill Weight Reg 14 oz / 397 g
Long 14.6 oz / 415 g
Lining Fabric Flite 15 denier ripstop nylon
Country of Origin Made in Seattle, USA of imported materials
Packed Size 9L
Average Weight Reg 24 oz / 680 g
Long 25.4 oz / 720 g
Sleeping Bag Shell Fabric Pertex® Endurance UL
Temperature Rating 20ºF / -6.67ºC
Zip Side Left

Customer Reviews (3)

Best in Class.Review by STN
Fantastic warmth to weight, durable but supple fabrics, roomy yet compact. I picked the slim cut for packing efficiency and weight savings; I'm about 5'10", 155 pounds, and I find that this bag is spacious and warm enough for me to wear a puffy and layers during summer alpine endeavors. It's also light and versatile enough for three season backpacking. If you're like me, and only want the very finest, then FF is worth the investment. (Posted on 3/14/2017)
Ultralight and warm. What more could you want?Review by Jon
When upgrading a few pieces of gear last year, I chose the Hummingbird UL 20 over two other top rated bags. After taking it along on treks through the Tetons, Iceland and the Adirondacks, I can confidently say this is the best down bag I've ever owned. Incredible loft, awesomely light weight and super warm. Absolutely worth every penny. Loved it so much, my fiancée and I splurged on a Feathered Friends down comforter this year. (Posted on 9/8/2016)
Awesome Summer BagReview by Bryan
This is my summer bag. Love this thing. It is incredibly comfortable and well sized. Very light weight, extremely high quality. (Posted on 1/7/2016)

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