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  • Marmot - Phase 20 Sleeping Bag: 20 Degree Down - Arctic Navy/Mykonos Blue
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  • Marmot - Phase 20 Sleeping Bag: 20 Degree Down - Arctic Navy/Mykonos Blue

Marmot Phase 20 Sleeping Bag: 20 Degree Down

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    • Arctic Navy/Mykonos Blue

    4 Reviews


    Shave weight, not comfort.

    Made for minimalist missions where accounting for every ounce is crucial, the Marmot Phase 20 Sleeping Bag helps you sleep comfortably in cold temps without burdening your backpack with excess weight. Its ultralight, heat-maximizing design makes it ideal for arduous excursions into the backcountry and gear-intensive climbing missions.

    850-fill Power Down packs amazing amounts of heat into an extremely lightweight and compressible package, and Down Defender protects it from moisture so you don't start shivering when soggy conditions strike. The ergonomic design, smooth-curved baffles, and Nautilus multi-baffle hood maximize heat retention to keep things streamlined without sacrificing comfort. Basically everything about the Phase 20 adds up to create one of the most advanced outdoor sleeping systems on the market.

    • Ultralight option for minimalist backpacking
    • 850-fill down has a high warmth-to-weight ratio
    • Down Defender protects against heat-robbing moisture
    • Smooth-curved baffles prevent down shifting
    • Nautilus multi-baffle hood limits heat loss
    • Full-length, two-way zipper for ventilation
    • Anti-snag zipper reduces fabric snagging
    • Wrap-around footbox increases room for your feet
    • Item #MAR013J

    Tech Specs

    Pertex 10D nylon ripstop
    850+ Fill Power Goose Down
    Down Defender
    full-length, two-way
    Shoulder Circumference
    Hip Circumference
    Foot Circumference
    Bag Length
    European Norm Comfort Rating
    European Norm Lower Limit Rating
    Stuff Size
    7.5 x 16in
    Claimed Weight
    1lb 7.3oz
    Recommended Use
    Manufacturer Warranty

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

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    Made it through the PCT

    • Familiarity: I've put it through the wringer

    As others have said, the zipper gets snagged quite a bit. I ripped a couple small holes, but patched them up with some repair tape and didn't lose any feathers. I ended up getting this bag pretty wet throughout my thru-hike (It rained unexpectedly in the desert) but it still kept me relatively warn throughout the hike without needing to wash/dry it. I make it through the snowy/wet Sierra in 2017 without any issues. Once I got home I washed it and threw it in the dryer with a few tennis balls and it's like new. I'm now considering taking it on the CDT, but I'm not sure yet. For the price, I'm on the fence about recommending this bag as there are other lighter options on the market, but for what it's worth it made it 144 days and 2650 miles on the PCT and I was comfortable with it.

    Zipper and temp

    • Familiarity: I've used it several times

    I agree with the two reviews below. I've used it a total of four nights and the final two of four were without a zipper. It often snags and it completely detached from the teeth strip.
    Regarding temp, I purchased a liner, one because I didn't really like the feel of the inside fabric against my skin but two to give it some extra heat. Generally dissatisfied with such an expensive bag. It does compress well.
    Backcountry did well by me when dealing with this.

    Wow I am really surprised by all these reviews. This bag was the second highest rated in Outdoor Gear Lab tests. They do mention the zipper snagging as one of the "Cons" but don't make it seem that big of a deal:

    zipper garbage

    • Familiarity: I've used it several times

    Zipper is way too light weight, always snags while opening or closing. After one outing, before putting bag away for storage, zipper pull fell off teeth strip. I was able to re-attach but had this happen on a cold dark night while camping, would have been near impossible to fix. I'm not sure if i'll ever risk using this gear on a backcountry winter outing. I now own a very expensive bag that is only safe to use in the backyard or while car camping.

    Did not meet temperature expectation

    • Familiarity: I've used it several times

    I recently took this bag on an 8 day desert backpacking trip in the Glen Canyon National Recreation Area (Utah). Temperatures dipped into the low 30s on two of these nights and I was cold in this bag. Granted they were damp nights. However, given that I was wearing additional clothing and given the temperature rating of this bag, I should not have been cold.

    Additionally, I found that the zipper often stuck when trying to zip up the bag. I understand Marmot using light zipper material; however, it needs to work smoothly in the backcountry.

    Hey Kara, I am not sure how familiar you are with temp ratings and sleeping bag warmth, but it's always best and you'll often be warmer with fewer layers. This allows your body heat to circulate within the bag. The 20 degree bag here, represents a general user comfort rating, but if you typically run cold, you may need a warmer bag. Sleep Pads can make all the difference too, i'd suggest an insulated air mat or foam self inflating for cold weather sleeping.