Echo Park 20°

Am I backpacking or car camping? If the low is 41 and I don't think it's gonna dip any further, than probably something that goes to 30F or so. \* Backpacking would be my old Big Agnes Deer Park 30F long down bag, or might risk it and run the Zenbivy 40F synthetic quilt (but I am also a human space heater) and good wool baselayers. \* Car camping would be Big Agnes Echo Park 20F long, because I sleep like I'm in my bed at home in that thing. General rule is that most bag ratings are more or less their absolute LIMIT rating. A 30F will help you survive at 30F, and is comfortable around 40-45+ depending on what temperature you typically sleep at. If you sleep too warm like me, you'll be fine. If you sleep a little on the cool side, I would offset the rule from around 10-15 degrees to at least 20F bags.

The lack of filling on the one side in the bag you mentioned is because the side you lay on (against the sleeping pad) will be compressed so much as to be generally useless as insulation. Cotton is a bad idea for anything intended to maintain warmth. I like the suggestion of the quilt and sheet made earlier.

I’d highly recommend a Big Agnes Echo Park. The interior feels more like cotton. Not at all restrictive and super comfortable. It’s also budget friendly. For a backpacking option, I really like my Zenbivy. The design seems a little gimmicky, but it’s just as comfortable as my car camping setup and really light and packable. Not at all budget friendly.

Big Agnes echo park long/wide. I’m similar in size to you and love mine! If you can’t find one for a good price (they sell $200 new but I got mine $140 on sale) then go for a camping quilt or Coleman big and tall instead

I love my Echo Park, but it's heavy.

30” wide sleeping pad of your R value needs and choice, and a big Agnes echo park (or similar) bag. The bag attaches to the pad to you can move all over all you want and the bag stays in place like a lightly tucked in blanket on top of you.

I have a Big Agnes single I LOVE so I’m jealous of all the folks here with the double. We have a flatlands fleece double bag and the Klymit double pad because they were the easy buttons through our wedding registry. The bag packs large for my taste but the pad is perfect. We sleep on top of each other at home and love snuggling all the same in the wild. Unless your trips are all ultralight backpacking, it’s quite cozy and romantic!