
NEMO
Disco 15 Series
Spacious for side sleepers; bulky, temp rating optimistic.

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We have kindercone sleeping bag from REI for our 2 and 5 yr olds- rated to 25 degrees. We love it
I got my kids these on sale at REI a couple years ago and they are great: https://www.rei.com/product/235979/rei-co-op-kindercone-25-sleeping-bag-kids
Yep that's what we did. REI adjustable childs sleeping bag. A Big Agnes little red 20 kids is what I bought for our kids.
Really so dependant on person. But I would guess you will be better served with the 30 as a one bag solution. My bag is I believe 25. It’s great into late spring and fall. Summer in hot and humid GA? No not really. I prefer like a 45 quilt or just stay home! But mid winter if it were 25-30 degrees I’d realistically be cold. Don’t abuse it please but rei has such a liberal return policy you could try one now in mid November to get an idea.
My wife and I have down filled mummy bags by rei that do this. In the last 6 years we’ve only zipped together twice. We camp a lot too.
My wife and I bought the same model REI mummy bags for this reason. The men and women's zippers are on opposite sides, so you can zip them together.
Oh that's not how the rei ones are

NEMO
Disco 15 Series
Spacious for side sleepers; bulky, temp rating optimistic.
Hammock Gear
Classic Burrow 20°F
Budget king; very warm but heavier than ultralight.

NEMO
Disco 30
Spoon shape for side sleepers; prone to zipper issues.

Western Mountaineering
VersaLite
Durable, very warm; premium price, too hot in summer.

Katabatic Gear
Alsek 22°F Quilt
Versatile 3-season quilt; secure pad attachment, high price.

Ranked #1
NEMO - Disco 15 Series

Ranked #1
Kelty - Tru.Comfort Doublewide 20
Ranked #1
Enlightened Equipment - Revelation APEX

Ranked #1
NEMO - Disco 15 Series

Ranked #1
Feathered Friends - Egret UL 20/30

Ranked #1
NEMO - Disco 15 Series