The combined power of Pertex Microlite and 850+ fill down is a beautiful thing.
- EN comfort-rated at 50-degrees F for mild summer conditions; lower-limit-rated at 43-degrees F for occasional use during late spring or early fall
- Premium 850-fill goose down packs down well, rebounds nicely after repeated compression, and features a high warmth-to-weight ratio
- Ultralight Pertex Microlight ripstop shell is highly breathable, water-resistant, and resists abrasion and wind like a champ
- DWR finish on the fabric repels frost, dew, and condensation
- Down-filled full-length draft tube protects against areas where cold can creep in unexpectedly
- Nautilus 6-baffle hood wraps around your head and provides 3D protection against heat loss
- Hood Muff is a warm down gasket around the face designed to keep heat in while keeping the drawcord away from your face
- Sewn baffles save weight ensure that the insulation stays in place so you don't suffer cold spots
- Stretch tricot baffles at foot and head regions extend the life and shape of bag and improve warmth retention
- Large trapezoidal foot box decreases constriction at the bottom of the bag
- Ground-level seams help prevent heat from escaping upwards through seams
- Nylon stuff sack and a storage bag included
- Filled and finished in Santa Rosa, California
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Share your thoughts
Good warm weather bag
- Familiarity: I've used it several times
This bag packs perfectly and weighs next to nothing. It keeps you warm on cool, late spring/early summer nights and will even keep you comfortable as fall begins. Add a liner bag if you are cold natured.
disappointed and cold
- Gender: Male
- Familiarity: I've put it through the wringer
As a disclaimer, this was my first down-filled sleeping bag. So take my disappointment with a couple of grains of salt, and feel free to offer your opinions on what may have caused my experience to be subpar.
I was very excited to receive my Atom - unlike the nearly 20-pound cotton bag I had recently hiked up a mountain with, this thing was clearly ready to go anywhere. As I do most of my camping in the summer, this seemed like the perfect sleeping bag for me.
After two years of use, mostly during the summer, I find myself pretty disappointed with the bag. Out of a total of maybe 40 nights slept in the bag, of which about 10 were actually in a tent or other minimal shelter and the rest in some sort of cabin or other more protected environment, I have grown to be apprehensive about using the bag even at nighttime temps of >50F. Despite my careful use of Nixwax Downwash on two occasions, and despite always storing the bag uncompressed in its large cotton sack, the down toward the top of the bag seems to have permanently lost its loft. There are cold spots throughout the torso region, though the lower parts of the bag still look almost as pristine as the day I bought it.
The weight and size are unbelievably excellent, and I don't discount the possibility that I may have somehow unwittingly failed to care for the bag properly. But I have never allowed anyone else to use the bag, and I have read all instructions, read quite a bit about down bag care online, and I tried at all times to take excellent care of the bag.
All in all, a big disappointment, despite the promising reviews and my initial happiness with the lightweight wonder that was a down sleeping bag.
At this point, I think I'm going to give the Marmot brand another try, with their Helium series. If nothing else, it should be warmer. Any thoughts?
fits well (the regular, and I'm 5'11")
seems to have loft problems
Great 2.5 season bag!
- Familiarity: I've used it several times
This is a reasonably priced (because you can regularly find it on sale for 10~20% off) and a very versatile sleeping bag that you can use as a 3 season bag if you sleep cold.
I've used it down to low 30s in just base layers at Shenandoah in November last year with Thermarest Trekker with a relatively low R-value of 2.0; I won't say I stayed warm, I felt cold during the night, but it wasn't horrible either. I'm 5'11", 170~180lbs (depends on the season), circumference around my shoulders (so the widest part of my body) is about 47", and the regular fits me very well in that it keeps in the heat well yet it leaves me enough room inside so that I don't feel cramped. The Pertex inner lining is silky smooth to touch.
The bad (minor):
My regular WITH the stuff sack weighs 22.7 oz (the stuff sack is 0.6 oz), so mine weighs about an ounce more than it's listed. The zipper can get caught at times despite the zipper guards, so that's the only minor complaint that I have.
Overall, a very solid 2/3 season bag (depending on how cold you sleep), and can compress very small if you like to pack light for your trips.
Great bag for warm weather
Love it. Very light, packs very small and a great bag for my Utah spring-summer-fall trips. Used it for about a year now. Seriously, very happy with it.
Bag feels cold
Hi, Im not normally a cold sleep, i got this to replace my 30 deg (mammut synth bag) bag because it was way too warm. i've only had it down to about 8 or 9C and was really cold, even with icebreaker 200 wool and a hat. do you think i got a under-filled bag? Im not a cold sleeper normally, quite the opposite in fact. im not sure what to do.
Best Bag Ever
Compresses well, immensely comfortable, unbelievably lightweight (a large Arnold Palmer weighs the same), and far warmer than its temperature rating suggests. The 850 fill down gives it an advantage over its brother, the Marmot Arete.
It's closest competitor is the Mountain Hardwear Phantom 45 but the Atom has a higher fill power, and additional fill weight contained inside. The Pertex coating is nice, allowing the bag to easily shed the cold dew of an early morning or negate any condensation problems your tent might have.
Get it, you won't regret it.
Very nice very very light. I just got it so I can not comment on warmth yet but ill check back once the weather warms up a bit. This Atom has a pertex shell not the lightforce nylon of years past. although it has the same dimensions as the pinnacle and arete bag it is not as roomy. shoulder girth is the same but seems smaller in the elbow area for some reason. Still comfortable though. I am 6 foot 3 225. Packs super small and plan to use it as a bag liner in my pinnacle bag for the rare below zero camping trip, and obviously as my summer bag.
What the heck is a draft tube???
What the heck is a draft tube???
It is that extra strip of material on the inside of the zipper that ensures that you do not have draft coming through the zipper area.
It insulates the zipper to help retain body heat.
In this picture (not a Marmot though), you'll see the draft tube. It's the long, black insulated tube that runs down the length of the zipper. In the foreground, you'll also see the green draft collar that insulates around your neck between the hood and the body of the bag. Both are important features to look for in quality mummy bag construction.
Not really a question, but important...
Not really a question, but important nonetheless. The Marmot Atom is a sweet bag and I'm not saying don't buy one, but isn't the lightest 3 season out there. The Western Mountaineering Summerlite is a 32 degree down bag that weighs in at 1lb 3oz. So, sorry to be a bubble-burster. I love my Marmot Lithium, but I also love my summerlite.
The description says it weighs 16oz, this is incorrect. The reg. is 21.52oz according to Marmot.
Two cents... Happy Trails!
MTHW's Phantom 45 is also a bit lighter, 1-2 oz :)
Atom over Horse Thief
I did a lot of research to find the right sleeping bag for 30-50 degree nights. I narrowed it down to the Marmot Atom and Big Agnes Horse Thief. I had trouble deciding which to get so I got them both so my wife would have one. My wife and I were both cold all night in the Horse Thief, which I returned because it was badly over rated and over priced for the way it performed. I really liked the design and wanted it to work but you cant sleep shivering. The Atom performed better than expected. I slept comfortable in a 1-person tent on nights of 30 and 33 degrees with long underwear. Very comfortable and packs easily to near nothing without a compression sack. It warms up instantly and is so light you can not feel the bag on you. Good product!
All good but....
Recently I bought a Marmot Atom and I was highly impressed by its weight and excellent design. However, when I tested this out camping in Northern Chile for a week with temperatures of between 5 and 10 C (40 and 50 F) I had an unpleasant discovery: this bag is nowhere near capabale of its supposed minimum. Even with my entire stock of warm clothing on I just managed it keep warm. Basically it seems the reason Marmot was able to make this bag so light is that they didnt put any down in it. My advice: this is a good bag but buy one that has a much lower rating than your needs
Does this bag come with a stuff sack?
Does this bag come with a stuff sack?
Yes it does.
A generous size storage bag is also included.
Only one trip but I'm happy
Took this bag on a 4 day trip in the Enchantments and have no complaints. It's light and packs very small. At temps in the low 50s in a Rab eVent Superlight bivy it was plenty warm. I'm looking forward to some cooler nights to see how low I can go with this thing. I'm 6'1" with broad shoulders and have enough room to move around in the long version. I'm very happy with the warmth to weight ratio.
So Far So Good!
So far this bag is great. Comfy, soft, and lightweight, and packs up great. This bag doesn't come with a stuff sack though, you have to purchase that separately.
Not super impressed after 2 years
This bag is wicked light - which is why I wanted it in the first place... however, It's not quite as warm as I hoped. I use it with a THICK thermarest camp rest and inside an OR GoreTex Bivy. I sleep very warm typically, but have been chilled on a few late september trips where I doubt the temp dropped much if any below 40 degrees. Had to put my down vest in with my feet. There was a bit of wind exposure in both cases. With my wide pad in the bivy i get cold spots where there's any pressure on the bag. Still a good bag and works well up to September as long as you don't get a cold front. I'm used to temp ratings in my Western Mountaineering bags easily exceeding the rating so was slightly disappointed. If weight's your main deal and you don't intend to push the rating this is still a fantastic choice. If you're thinking full 3 season bag (October) in the rockies, better rethink and get a 20 or 30 degree bag minimum.
The Backcountry description says 1Lb or...
The Backcountry description says 1Lb or 16oz, but under the Tech Specs and other places I've checked it says 1lb 5oz or 21oz. Which one is it? Is the actual bag itself minus stuff sacks 16oz? Otherwise it's hard to see why you'd pick this over the 24oz Marmot Arete? Thanks in advance
1 lbs 5 oz / 610 g
best bag on the market
The other reviewers have pretty much hit it on the head. This bag is amazing. First, it fits into an XXS stuff sack fairly easily, takes no more than 3 minutes to stuff it. When you take it out of the stuff sack, i would estimate it takes about an hour to get its full "fluff" back. At first, I was weary because it doesn't appear to have a much fill as my old Conness, but after using it on some cold nights, my worries were abated. This will keep you warm below 40deg, I used it at around freezing (guessing because there was frost on the ground) and it was plenty warm. Combine this with a NeoAir and you have a sleeping set-up that's around 2lbs 3oz. Not bad for the ultra-light nuts such as myself. Another added plus, Marmot gives you a nice big storage sack for your bag when your not using it.
This bag is great. I had a regular (read short), fat, and heavy 30 degree synthetic that weighs 3+ lbs before I bought this. Now my long version Marmot bag weighs in at 1lb 10oz and packs down super small. It's true to the 40 degree rating and great for spring summer and fall. I've even thrown in a lightweight fleece liner and slept comfortably below freezing at Blue Lakes near Ridgway, CO. Would definitely recommend! (I found this for cheaper at another site but wanted to buy from backcountry because they're awesome...and they matched the price)
What´s the best choice for a three season...
What´s the best choice for a three season sleepingbag, Marmot Atom or Western mountaineiring Ultralight?
And between Marmot Hydrogen or Western Mount. Alpinlite? What are the differences between their outer materials? What is the maximum stuff size for both models?