Sidewinder SL 20°

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.

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

It really depends on a person, I'm very comfortable in my side sleeping big agnes 20 at 22ish in just my underwear. And it's a very roomy mummy bag

What you are describing to me just sounds like a poor quality fabric. Not all sleeping bags created the same. I love my big agnes also because of that inner fabric. Maybe try another brand? Otherwise a liner could help as well

The sidewinder is really only comfy if you sleep on your side. Any other position doesn't feel good for me at least. So I prefer more versatile bags. But if you sleep on your side it's pretty great

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.

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.

I like my down version a lot. My only complaint it that it sheds a lot.

I love my big Agnes sidewinder

I got the big Agnes sidewinder bag. It's a dream. It's for side sleepers, so there is tons of room. When its warm, I unzip and use it as a blanket. It is sooooo comfy.