Find Your Store
Home Page

Cart, contains 0 items

When autocomplete results are available use up and down arrows to review and enter to select. Touch device users, explore by touch or with swipe gestures.
Expert Help
Earn Rewards

Protect Down Sleeping Bag: 0F Down

4.625 out of 5 stars
16 Reviews

Out of Stock

Don't worry though, we have a lot more Down Sleeping Bags in stock than that.

Shop Similar Products

Why We Like The Protect Down Sleeping Bag

When we have sketchy routes and big sends in our future, we rest easy on the side of the mountain in the Mammut Protect Down Sleeping Bag. This zero-degree bag uses lofty duck down and a fully waterproof and breathable membrane to help us dream of summits instead of wallow in wetness.


  • Mountaineering bag built to ensure you are ready for tomorrow
  • Low-temperature rating encourages camping in the harshest weather
  • Duck down uses lofty and lightweight feathers to trap heat
  • Polyurethane membrane seals out unwanted moisture, breathes well
  • Durable face fabric handles rough sleeping situations with ease
  • Mummy shape packs down small while preventing heat from escaping
  • Item #MAMU5FJ
Responsible Collection
Bluesign Approved, Recycled/Repurposed, Responsibly Sourced
[membrane/laminate] PU, [face fabric] 100% nylon, PFC-free DWR coating, [lining] 100% recycled polyester
700-fill duck down (RDS-certified)
3/4-length (54in), center
Max User Height
[large] 84in
Shoulder Circumference
Hip Circumference
[large] 30in
Foot Circumference
Bag Length
Draft Tube
[internal] 1 stow
Pad Retainer
two-way zipper
Fill Weight
2lb 1.5oz
European Norm/ISO Comfort Rating
European Norm/ISO Lower Limit Rating
Storage Sack
Stuff Sack
Stuff Size
[large] 8 x 8 x 13in
Claimed Weight
3lb 12oz
weekend camping
Manufacturer Warranty
2 years

Overall Rating

4.5 based on 16 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 1 reviews
3 Stars - 0 reviews
4 Stars - 3 reviews
5 Stars - 12 reviews

Fits Small

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


Selecting an option will reload the available reviews on the page
2 out of 5 stars

April 12, 2024

Not durable, but warm

I've used it several times
Size Bought:

On the very first trip I took with this bag (Alaska backcountry ski/camp with cold temps) it ripped in the tent and was spewing down everywhere. The material just seems really thin and prone to finding snags. What I like about it is the thoughtful placement of the zippers and interior pocket. Otherwise, it is not a durable bag meant for real adventures in my opinion and the shoulders are a bit narrow. I would not buy again.

5 out of 5 stars

December 18, 2023

Very comfortable, lots of great features and you'll stay warm

Originally reviewed on

5 out of 5 stars

December 7, 2023

Favorite 0 degree bag I've ever slept in

This bag is money. I got this originally for overnight ski mountaineering trips in the springtime, which it obviously is perfect for, but started to include this bag in my hunting camping kit, especially as the season stretches into Oct/Nov. I was hesitant at first because I hate overheating and was worried I would be too hot in a 0 degree bag when it wasn't cold enough. I was stoked with how the bag performed on those hunts as it regulated heat well enough that I didn't sweat or over heat, but also kept plenty warm in the chilly mornings. Very comfortable bag, with a nice hood, phone storage so your battery doesn't drain and it packs down quite well for a 0 degree bag. 11/10 would recommend.

Originally reviewed on

5 out of 5 stars

July 16, 2023

Most comfortable sleeping bag I've owned

The title says it all, the most comfortable and warmest bag I've ever owned. I take it with me hunting, fishing and camping.. although they are usually all the same.

Cody P

Originally reviewed on

5 out of 5 stars

May 8, 2023

Great Design and warm

This bag is very warm and well made. I really like the side zips for zipping up.

Originally reviewed on

4 out of 5 stars

April 21, 2023


ARM. ZIPPIES. There is no better experience then making breakfast in the warmth of your bag through your arm zippies. Seriously its great. This is a very lofty and warm bag I have never been cold in it. In fact I once spent the night in a winter storm with the bag unzipped because I was far far to warm. It would be nice to see this bag made with a goretex windstopper or similar membrane for standalone bivying in nastier weather, but maybe im the only one who likes to suffer that much. The stuff sack that this bag comes with is not very good for two reasons: 1) It is not waterproof, in the coast mountains this is very very bad. 2) It packs the bag down into a giant block that does not fit very well into a pack. 3) it does not pack the bag down as small as it can go. All of these issues are easily alleviated by buying an aftermarket compression sack. Also this bag comes with a mammut branded eye shade, and ear plugs that match the color of the bag. Neat.

Originally reviewed on

5 out of 5 stars

April 12, 2023

Great bag for winter traverses

The bag itself was perfect on a three day ski traverse across the Dolomites. The ability to use my arms without getting out of the bag on cold early morning starts made waking up 10x better. My only frustration was the stuff sack. It's not bad, but a beer cracked in my pack and it made it through the stuff sack leaving a nice IPA aroma on the bag once we set up camp. Could be user error but I just bought a different dry bag that packs down even smaller. This bag is everything you're looking for if you want to travel light through snowy mountains.

Jacob F

Originally reviewed on

4 out of 5 stars

April 9, 2023

Does everything great but could have sort of waterproof membrain on the outside to make it 5*. love the 2 arm zippies

Originally reviewed on

5 out of 5 stars

November 27, 2022

Perfect for Kilimanajaro

I bought the Mammut Protect Down Bag -18C to stay warm and get a good night sleep on a 7 day climb of Kilimanjaro in early July. This bag did just that and I'm glad I bought it as my friends that rented bags said they were a bit chilly in theirs. I am a stomach or side sleeper which can make finding a good sleeping bag difficult. This bag worked well for me to do both. Stomach sleeping was a bit awkward but I turned the bag 90 degrees so the zipper was on the side and it worked ok. Some sleeping bags have less insulation on the bottom than on the top which could have kept this technique from working but I didn't notice that it's this bag.

Originally reviewed on

5 out of 5 stars

November 8, 2022

Great Bag

I love this bag, its warm, sheds the moisture/dew in the morning, has holes to have your arms outside the bag but keep your core temp warm, packs up in a small bag and is all around a quality product!

Originally reviewed on