Feathered Friends Petrel 10 UL Ultralight Women&
Feathered Friends Petrel 10 UL Ultralight Women&
Feathered Friends Petrel UL 10 Degree Ultralight Women&

Petrel 10 UL Women's Sleeping Bag

Regular price Sale price$639.00
54 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.

*Sleeping bags may take up to two weeks to ship. Please check our Shipping Info page for more details. Thanks!*

Our warmest three season bag for the female adventurer. Based on the ideas of our testers, the bag features extra fill in the footbox and chest while maintaining a sleek profile and light construction to maximize the warmth from the 950+ fill down. The Petrel is not only an excellent choice for spring and fall adventures, but also a popular summer bag for the coldest of sleepers and a longtime favorite for summer climbs of Mount Rainier.

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


  • Mummy shape with #5 YKK two-way, separating zipper with locking sliders
  • Full draft 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 Women's mummy sleeping bags are built a bit more trim around the shoulders, but more space in the waist and hips.

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

Additional Info

Ideal Sleeper Height Small 5' 3" / 160 cm
Med 5' 9" / 175 cm
Dimensions 54" shoulder / 56" hip / 38" footbox
Zipper Right Side
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 Small  1 lb 4 oz /  567 g 
Med  1 lb 5.3 oz /  604 g
Average Weight Small  1 lb 14.2 oz /  857 g 
Med  2 lb 0.3 oz /  916 g
Packed Size 11L


Customer Reviews
4.8 Based on 54 Reviews
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Heather A.
United States United States

Still cold. :(

It's weird but my experience with this bag seems to be unlike everyone else's. Unfortunately, I've had this bag about 3 or 4 seasons now and I've just never been warm in it. (Forget about 'toasty'.) I was just out this last weekend.... weather was low 40's. I was wearing 260 weight Marino wool leggings, undershirt, and 1/2 zip overshirt. As well as knee high Smartwool socks and a fleece. And I was still cold. I think it may be due to the fabric. It seems really 'light', so light that it's always cold to the touch. And it just starts to creep chill on you even through clothing. Before this bag, I've tried the REI Magma 15, and a Sea To Summit 15 degree bag. I'd heard really good things about Feathered Friends and even went down to 10 degrees to try to be warm.... (For reference, I'm using a Exped Dura 8 (R-value of 7.8) sleeping pad and a Big Agnes Seedhouse 3 w/ rain fly. I store my bag uncompressed in a large bag.)

  • Fit Runs SnugVery Roomy
  • Warmth Not WarmExtremely Warm
  • How would you rate the quality? Not greatExcellent
United States United States

Comfy - almost warm enough in 43F.

Only used this 1 night so far but looking forward to more. Love the neck baffle feature. Zipper baffle kept cold air out. I used this during mild weather with a low temp of 43F. My feet and upper body were perfectly toasty warm, however I was cold from my hips to my knees, which was uncomfortable enough to wake me up. I sleep very cold. I used the Petral 10 UL in a double wall tent, with both mesh and fly fully zipped, on top of an Exped MegaMat 10 sleeping pad with 8.1 r-value, and wearing Patagonia mid-weight base layers with Smartwool mountaineer socks. I had to pull another sleeping bag over my legs for the remainder of the night. I'm planning to add more layers on my legs for next time - including down filled pants. I intend to use this sleeping bag for backpacking if I can figure out how to stay warm. The only bags that have ever kept me warm on chilly nights have been far too bulky to backpack with.

  • How would you rate the quality? Not greatExcellent
  • Warmth Not WarmExtremely Warm
  • Fit Runs SnugVery Roomy
United States United States

Best Sleeping Bag for Cold Sleepers

I am an extremely cold sleeper and have a hard time producing enough body heat to keep down sleeping bags warm enough throughout the night. I had gone through two sleeping bags (Nemo Disco 15 & Mountain Headwear Bishop Pass 15) and would be cold sleeping in 40 degrees. I went into the Feathered Friends store to test out the sleeping bags and I rented the Egret 20 for a night when temperatures dropped to high 30's to low 40's. Unfortunately, I was still very cold overnight. (I sleep in thermals at night and try to warm up my body before jumping in my sleeping bags). The staff was SO incredibly wonderful and refunded me for the rental since I had had such a miserable night. I was recommended the Petrel 10 UL and I added 2 oz of fill - I just took it to a backpacking trip for 5 nights in Patagonia. The lows were in the 40s but I was sweating in my bag and had to remove my thermals and keep the bag partially unzipped which is just WILD for me. I'm excited to test it in colder temperatures when backpacking into fall. I couldn't have appreciated the staff enough. Awesome people with high quality equipment. 10/10 recommend.

  • How would you rate the quality? Not greatExcellent
  • Warmth Not WarmExtremely Warm
  • Fit Runs SnugVery Roomy
Crystal D.
United States United States

Comfy, light and warm.

I wanted a zero degree bag as I run quite cold, but I also wanted an ultra light bag…this one seemed to fit almost all the requirements. It’s a little long (I’m 5’6”) and I bought the bigger one, so lots of cozy space and I can fit my whole head inside. The zipper is a little sticky so I have to be careful. I’ve only used it in about 35F weather and so far so good. I imagine I’ll have to have a liner or more layers on if it was below zero, just to take up the space inside. Otherwise, love how cozy it is and how small it packs down!

Lauren B.
United States United States

Never been warmer

I'm a cold sleeper and have been using my Flicker UL 20 degree quilt (zipped up in bag format) for years. I'm always cold, and my puffy has been a necessary part of my sleep system. Decided to treat myself and upgrade and oh my god it's a dream come true. It was like sleeping in a toasty cloud. I went to sleep with a smile on my face, and never woke up from being to cold. Highly highly recommend. The only draw back that I encountered was when trying to stuff it into my backpack, it stayed kind of inflated with air so it was a slow process compared to my Flicker. I think this might be easily solved by stuffing it foot box first next time, TBD.