Uploaded February 2023 | Updated September 2026, 3 weeks ago

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Is Mountain Hardwear Phantom 0° Down Sleeping Bag the best down sleeping bag? I took it out in 7 degree temperatures with industry certified thermometers and tested it out! I would not recommend Mountain Hardwear Phantom 0° Down Sleeping Bag below 10 degrees after my usage and testing. While Mountain Hardwear Phantom 0° Down Sleeping Bag is very comfortable, light and sexy, it really struggled at 7 degrees. I was amazed as this is a very expensive bag, which comes with big expectations. But it just did not perform. But, if you keep it above 10 degrees I think you will be happy. Here are the results!

Air Temp: 7° Degrees
Starting Temp In Bag: 31.7° Degrees
5 Minute Bag Temp: 59° Degrees
10 Minute Bag Temp: 68° Degrees
15 Minute Bag Temp: 72.5° Degrees
20 Minute Bag Temp: 74.4° Degrees
30 Min Bag Temp: 76.1° Degrees
35 Min Bag Temp: 77° Degrees
40 Min Bag Temp: 77.5° Degrees
45 Min Bag Temp: 76.2° Degrees

From Mountain Hardwear:
"One down bag to rule them all—whether you're a climber, skier, or backpacker, the versatile, gold-standard Phantom™ is a critical part of any overnight kit. This time-tested lightweight down bag is ideal for high-alpine traverses, backcountry hut trips, and multi-week backpacking adventures."

Link to Bag:
mountainhardwear.com/p/phantom-0f%2F-18c-1829201.html?dwvar_1829201_color=675

How I Test Sleeping Bags:
youtu.be/ANUlVxduN84

Previous Sleeping Bag Testing Videos:
youtube.com/watch?v=svzTs6cx9YA
youtube.com/watch?v=im_6J5WVEms
youtube.com/watch?v=09puLSAmU84
youtube.com/watch?v=_-EMsTBMVKg
youtube.com/watch?v=ISmnj3gy2-M
youtube.com/watch?v=c_qLHGQwAXE
youtube.com/watch?v=7yUvIj-aBZ8
youtube.com/watch?v=3c8lTg-rPWw
youtube.com/watch?v=P6PQsuV-OIQ

My Backpacking Gear Playlist:
youtube.com/playlist?list=PL40B4C58956B81A74

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