NEMO

Sonic -20 Sleeping Bag

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Overall

#281 in

Outdoor Sleeping Bags

according to Reddit Icon Reddit

Sentiment score50% positive
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Last updated: May 9, 2026

Reddit Reviews

Reddit IconKcamyo
6 months ago

You got me thinking. I might be safer to just get the Nemo then. Realistically, I doubt I will be outdoors below -20C. At least with the Nemo, it’s pretty versatile

6 months ago

Thanks for the feedback. I’m leaning toward the NEMO -20°F now. A few people told me to go with a -40°F to be safe, but I’d like a bag I can actually use across different conditions. I just don’t want to make the mistake of choosing the wrong one, since this is basically a lifetime purchase, at least I hope. I’m using the Tensor All-Season pad, which I believe is around an R-value of 5.5. Definitely could go higher

5 months ago

I got the Nemo -20!! Went on sale so I had to grab. thank you for everyones help

3 months ago

correct, Nemo Sonic -20F

3 months ago

It’s been great so far. I don’t have other winter bags to compare it to at the moment, but it packs down surprisingly small and is fairly lightweight for a true winter bag. The hooded head design does a really good job of sealing in warmth, especially in colder temps, though I can see how it might not be for everyone, if you don’t like a more enclosed feel around your head, it could take some getting used to. Nemo’s warranty and customer support have also been solid. It took me a while to decide, but it ultimately came down to value, I found this on sale for about $300 less, which made the decision easy.

Reddit IconSuitable_Sentence_46
7 months ago

I like the Nemo sleeping bags that have the gills. You can open them when it's warmer and zip them up as the temperature drops. Works much better for me than just opening the side zipper, which I find let's too much heat out.

Reddit IconAlfnadoawaywoah
8 months ago

This. I hate mummy bags. I move too much in my sleep. My Nemo takes up a bit more space in my pack but it is so comfortable and a good night’s sleep, where I can fully roll around in my bag, is worth it. I will never go back to a mummy bag.

Reddit IconBiggyBiggs
3 months ago

It might depend on how you're built, but I can get my leg up like that inside my Nemo bag. I have short legs, though.

Reddit IconCrazylady5665
5 months ago

I really wanted to love the Nemo, but if OP is a smaller person, Id warn they have too much dead space.

Reddit IconDifficult-Brain2564
24 days ago

Nemo. Best sleeping bag I have used. On my second one.

Reddit IconDinoAndFriends
2 months ago

I'm a side/stomach sleeper and love my Nemo sleeping bag. I have a synthetic one and it's quite bulky, but the down ones would compress better.

Reddit Icondraggingmytail
about 2 months ago

Ok so it’s important to know that the degree rating on bags is the survival rating. This is the “you probably won’t die of hypothermia, but you’re not gonna have a good time” rating. Rule of thumb is to add 10-15 degrees F to any bag rating for the comfort rating. Always err on the side of caution with colder temps. If you get warm, you just open the bag. Some bags even have vents (my Nemo bags do). There are some tricks to stay warm with a bag, but for high 20’s, get at least a 15 degree rated bag. And have your son bring some good under layers to sleep in as a caution.

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