Big Agnes Sidewinder SL 20°

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Overall

#36 in

Outdoor Sleeping Bags

according to Reddit Icon Reddit

Sentiment score71% positive
5
2
0
Last updated: Apr 21, 2026

Reddit Reviews

Reddit Icondkwpqi
6 months ago

Reputable brand. Will likely be expensive. For you 5°C you want a 0° or a -7° bag. In north America that would be a 30 or a 20 and I recommend a 20 Figure out synthetic vs down and side sleeper vs back sleeper. Watch a bunch of YouTube. Read articles.

6 months ago

I'm in Canada. My Big Agnes bag is still called sidewinder 20 😁 Over the years I've learned some understanding of freedom units

Reddit Iconholysmokrs
about 2 months ago

I bought the 20 and love it. I honestly hated backpacking until I got this and could sleep on my side. We mainly only do winter camping, so I needed the 20. I don't find it overly bulky by any means.

about 2 months ago

No, I don't feel it's any thinner on any side imo. Mainly because there isn't really a "bottom". Its typically in the 20s when we're camping and I'm still in pants, sweatshirt, and socks. So take that for what you will. I think it depends on everyone's tolerance ha.

Reddit IconOwn_Mastodon2719
11 months ago

I LOVE LOVE LOVE Durston Gear tents. I've got the Xmid 2 and now the Xdome 2 as well. Superior to pretty much any comparable tent that bats way above it's price tag. $269 and under 2lbs all in. As far as sleeping bag, my first one was the Big Agnes sidewinder 20⁰ bag and I liked it. But after having gone out more and more I wanted something that packed smaller so now I've got an enlightened equipment convertible bag/quilt that's 950 down. Packs smaller, a lot smaller, and is substantially warmer overall. But we are comparing a $175 bag to a $400 one.

Reddit Iconbulmas_hair
11 months ago

Seconding the Big Agnes down sleeping bag! I’m a side sleeper and finally invested in a BA Sidewinder after years of getting tangled up in my standard bag. More than worth the money.

Reddit IconPeterVankman007
5 months ago

Ohhh well my big Agnes mattress, my side sleeper big Agnes sleeping bag, my marmot tent

Reddit Iconpolicko
8 months ago

This summer is my first time sleeping in a new bag shape too. I bought the Big Agnes Sidewinder because I’m a side sleeper, and it was so much better than my last bag! Stayed SO warm and cozy.

Reddit Iconrunslowgethungry
about 2 months ago

Did this person have any basis for their statement? They make very good bags. They're not the lightest or the cheapest but they are also not the heaviest or most expensive. They're very good quality bags made by a trustworthy company that backs up their products with a good warranty.

Reddit IconZers503
11 months ago

Have a Big Agnes 20 and a Magma 20. Both down both compress well. A few years ago, I switched to those liners in the summer and love them. Warm enough in July. Pack extremely small.

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