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Rated 5 out of 5 by from Awesome bag Great, beautifully made ultralight bag. Zipper may not be the best, but not that bad and nowhere near a deal breaker for me. First reviewer sounds like such a pouter. Zipper is full length, opens from bottom for venting. This is my 3rd down bag in 15 years and it's BY FAR superior to others I've used. I love it. You probably will too!
Date published: 2017-04-07
Rated 5 out of 5 by from Solid Lightweight Bag I was disappointed REI has not carried the women's version of the bag, but I am glad I tried this. It is very comfortable and lightweight. I am a woman and sleep cold, but I was more than warm enough at around 20 degrees with appropriate clothing. I could definitely use it in even colder temps. The zipper requires a delicate touch, but it is not unreasonable given how light this is. I only used this once and hope it holds up well.
Date published: 2017-06-03
Rated 3 out of 5 by from Beautiful Bag Let Down by a Poor Zipper This is a beautiful ultralight sleeping bag. It is well constructed, light, and lofty. ...but the poor zipper function may be a deal-breaker. The quality of the construction and materials is immediately evident--as is its almost insubstantial (lack of) heft. After being stuffed all day, the bag quickly expanded to completely fill the large mesh storage sack. The cut is nice... BUT THE ZIPPER! Oh, the zipper. Sigh. There are some narrow flexible stiffening tapes on either side of the zipper--but they don't seem to keep the zipper from gobbling up the light 10D cover fabric. In order to get into the bag I had to carefully guide the zipper pull up--and it still wanted to grab the fabric when it turned the corner by my shoulder. The big problem, though, comes when you need to exit the bag. I encountered repeated and persistent difficulty in unzipping the bag. I thought for a while that I would not be able to get out without damaging something. I tested the zipper from outside the empty bag and it was still quite challenging to operate it. I cannot imagine that I would fail to tear the bag after a week of using this zipper--and I would be afraid to zip it to my chin; lest I be unable to get out. The zipper design is a big let-down for me. The zipper is the key to using a sleeping bag--and you have to get it right. I may have to return this bag...which would be sad. Design: The hood is a fabulous design! It provides excellent protection without trying to smother me and it has room for my Sea-to-Summit Aeros Pillow to snuggle inside. The draft tube is big and round. The baffles seem to keep the down from shifting (as least with new, dry down). It fits into the included stuff sack (with a little work), and would clearly compress smaller, if you desire. Durability: This is definitely an ultralight bag! The fabric, though tough for its weight, is very light and will require a little bit of care to protect. I think most users would be better served by the slightly roomier cut and secondary zipper (along with the more durable fabric) of the Marmot Helium. ...but this bag is 9 ounces lighter than the Helium (which is why you are looking at it, right?) and I have been craving a lighter full-featured three-season bag. Temperature Rating: I am an average (or slightly warm) sleeper, and my limited testing, as well as side-by-side comparisons to other bags with known characteristics, suggests the Phase 20 is true to rating. I think I would be comfortabIe to 25 degrees or below in the Phase 20. It is not as warm (nor as lofty) as the older Marmot Aspen 20 (which weights 43 ounces in regular length) I have used for years--I consider that a very warm 20 degree bag. It seems a little bit warmer than the REI Igneo. Sizing: I am 6'1" 190lbs with wide shoulders and wide hips. I ordered the Long for the extra width. I have enough room in the bag to move not feel confined. It's not as trim as the REI Igneo; which I found just a little too tight for me. I would say it is not quite as roomy as the Marmot Helium--and the secondary zipper that lets you open up the chest/neck section of the Helium makes it feel much easier to enter and exit. But the Phase does not compromise usability for weight-savings. I think Marmot got the sizing right.
Date published: 2017-04-06
Rated 2 out of 5 by from Very light weight but the zipper broke I bought this for my two day scalping. Very nice and light material...was very excited to try it, but the zipper broke on the very 1st night, so needless to say I was freezing the whole night.
Date published: 2017-06-14
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Questions & Answers

Do you plan to carry the women's version of this bag? It's one of the few sub 2lb bags rated for temps this low. I would love to buy it!

Asked by: Imbachick
As of February 2017, we do not have plans to carry the women's Phase 20 sleeping bag.
Answered by: REIservice
Date published: 2017-08-31

What type of goose down is used in this bag?

Asked by: PTK1
​This sleeping bag is filled with certified 850-fill-power down.
Answered by: REIservice
Date published: 2018-01-23

Is the YKK a #5 YKK or a different YKK zipper? I'd like to match one of these to a Feathered Friend Egret and the Egret uses the #5. Thanks.

Asked by: Stephen
​Yes, this sleeping bag has a #5 YKK zipper.
Answered by: REIservice
Date published: 2018-02-09

Does this bag include a stuff sack?

Asked by: GregK
​Yes, this sleeping bag includes a stuff sack.
Answered by: REIservice
Date published: 2018-02-19
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