How to Choose Sleeping Bags for Backpacking
Marmot Phase 30 Sleeping Bag
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You'll soon develop the knack for sleeping anywhere when you're tucked into the Marmot Phase 30 sleeping bag. Water-resistant down, curved baffles and light, durable fabric ensure all-night comfort.
Shop similar productsKey Details
Fill
Goose down
Temperature Rating (F)
33 degrees
- Certified 850-fill-power down with Down Defender to fend off moisture
- Smooth, curved baffles reduce down shifting and cold spots; multi-baffle hood limits heat loss
- Anatomical, wraparound footbox increases insulation and room for your feet, creating more warmth and comfort
- Full-length, locking YKK 2-way zipper with antisnag slider is backed by a snagless insulated draft tube
- Internal stash pocket
- EN tested
- Filled and finished in Rohnert Park, California
Imported.
Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.
Each bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
View all Marmot Backpacking Sleeping BagsEach bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
| Best Use | Backpacking |
|---|---|
| Tested Lower Limit | 33 degrees (F) - EN |
| Tested Comfort | 42 degrees (F) - EN |
| Temperature Rating (F) | 33 degrees |
| Temperature Rating (C) | 1 degrees |
| Ultralight | Yes |
| Shell | Pertex 10-denier ripstop nylon |
| Zipper Location | Left |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | Goose down |
| Fill Weight | 8.5 ounces |
| Lining | Pertex 10-denier ripstop nylon |
| Sleeping Bag Shape | Mummy |
| Stuff Sack Size | 6 x 12 inches |
| Stuff Sack Volume | 5.6 liters |
| Gender | Unisex |
Buying Advice
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Joey
Great for backpacking
7 years ago
Got it in the mail a few weeks ago and so far only been able to take it on one overnighter into the backcountry. I was amazed at how light and compact this bag is after carrying it in and out of canyons along the Colorado. Adequate room for me (though I'm a lanky 5'10"), but I could see someone over 6' wanting the longer version. Kept me warm and comfortable through the night. Not sure how cold it got, maybe 40, but the winds were brutal, kept pulling tent stakes out of the ground. Can't wait to take this on a few bikepacking trips and more backcountry hikes. Can't speak to the durability of the shell just yet, but my dog thought it was his so we'll find out soon enough.
Yes , I recommend this product
Originally posted on marmot.com
Rondak_Ryan
Upstate NY
Sleeping bag review
8 years ago
Used this for the first time on a night where the temperature dropped down to about 35 degrees (F). I was a little chilly, but then i zipped it up all the way and was comfortable the rest of the night. Very light, compact, comfortable. Exactly as advertised.
Yes , I recommend this product
Simba
Molas Pass, Colorado
Phase 30 Sleeping Bag is perfect for Bikepacking
5 years ago
[This review was collected as part of a promotion.] I bought this sleeping bag for a 7 day mountain bike packing trip from Durango, CO to Moab, UT and it was perfect! Lightweight and compact to store which is so important bike packing but warm enough at freezing temperatures. A great product!
Yes , I recommend this product
Originally posted on marmot.com
KungFu
Leavenworth, WA, United States
light as a feather, no bells and whistles
7 years ago
I purchased this sleeping bag because it was very lightweight and packed up extra small. It delivered big time! Here are some things you might consider before purchasing this bag though. First off, the bag is pretty narrow, especially around the foot area. Don't expect that you'll be able to put on a pair of socks while zipped up in the bag. The zipper is small and can get stuck from time to time on the outer material. Overall, I love this bag and understand that there are sacrifices to be made with such a lightweight bag. I'm 6'4" and the Long fit great.
Yes , I recommend this product
Originally posted on marmot.com
Coach Rev
Gothenburg, NE, United States
Tall man with few bag options
8 years ago
I will qualify this right away - I haven't actually used the bag yet! What I have done is checked it's construction, weight, volume, and most importantly it's fit. At 6'9" I can't use just any bag. I discovered online that measurements on this are wildly variant as well, and after checking with Marmot direct, I discovered that REI is short on their "long" size by about 8". Now that I have it I can confirm it. The bag fits well, and at least indoor on the floor was quite warm. My primary concerns that aren't really concerns so much is on the quality of the zipper, and also on the tapered top which zips over the shoulders slightly, making it a bit difficult to zip up all the way from inside. Other than that, this bag appears to be able to do exactly what I want, and I will find out soon! BIG NOTE: LONG SIZE BAG DOES RUN LONGER THAN LISTED - ABOUT 86" INTERNAL~!
Yes , I recommend this product
LizHamilton242000
Crescent City, CA, United States
Dried out quickly
7 years ago
My only complaint was how easily the zipper gets stuck. I was trapped with my arms inside and couldn't reach my headlamp to see what was going on. But I was warm and the bag dried quickly after I sweated all over it inside my bivy sack. I would've been more comfortable in a tent. Then it would've been perfect. Even though my bag felt damp I stayed warm and it dried completely in a few minutes in the sun.
Yes , I recommend this product
Originally posted on marmot.com
AliB
Love it
6 years ago
I bought this sleeping bag for a trip to the North Cascades and it was absolutely perfect. Kept me comfortably warm when it got into the 40's at night and was light weight for back packing. The bag does stuff down pretty small, but would've been nice if it had been even a little smaller. Either way, definitely recommend and look forward to using on upcoming trips.
Yes , I recommend this product
Originally posted on marmot.com
Ryan413
Western Mass
Great all around bag
6 years ago
I’ve only had the bag about a month now. I can see the frustration with the zipper but as long as you keep the line tight while sipping up I’ve had no problems, foot box is a little tight for me but I’m also 6’5” 225 so most bags are. Bag is super light and compact while stuffed. Great product over all and looking forward to bringing it on the JMT in July.
Yes , I recommend this product
Originally posted on marmot.com
johast
Phase 30
7 years ago
Small, light, comfortable, and the advertised temperature performance rating mostly matches my sleep experience. The only thing I would wish for is bit quieter/less plasticky sounding material, but that may not be a possibility when making a bag that weighs so little. All in all, it is the sleeping bag I use more than any other and I am glad I purchased it.
Yes , I recommend this product
Originally posted on marmot.com
eeeeeeeeee
Vancouver, BC, Canada
Great bag
7 years ago
Bought it for the weight. Continuous baffles let you shift the down around. Agree with other reviewer - fabric easily snags, and given how thin it is, you have to be careful with it. Only other issue is the anatomic footbox can feel constricting, especially if you like to spread out a bit, but for the weight, this bag is excellent
Yes , I recommend this product
Originally posted on marmot.com
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