NEMO - Disco™ Men's Endless Promise® Down Sleeping Bag (15°F/-9°C)

Im a side sleeper and a turner at 6'3" and 230 pounds. The quilt is great. However, if it is so cold you want an enclosed sleeping bag, I personally carry the Nemo Disco 15 large. I open this and use it like a quilt at times. https://www.rei.com/product/251886/nemo-disco-15-endless-promise-down-sleeping-bag-mens

I'm a 230 lbs 6' 3" guy and this is a great bag for me. Used in 19F and it was warm. I am a side sleeper so the ability to turn helps a lot.

My NEMO Disco 15 (Mens long) compresses to about 9" X 11"

I have the nemo disco 15 in the big boy size.  If you get cold easily,  I'd recommend the little bit of extra bulk and weight for the 15. The spoon shape is much nicer than a mummy bag. 

I have the disco men's long in -9C and used it in the rockies on a trip we got snowed on with a good sleeping pad. I would say it's a little cold for late fall.  Or the one I have is a bit underfilled maybe. I also find it a bit tight but my shoulders are about 24" across so I'm pretty big. Sea to summit ascent II looks to be an upgrade warmth wise and has a better zipper for venting.

Love my Nemo bags and always recommend them. Great product, great customer service and repair, and good price. And they make bags that are specifically cut to minimize dead space but accommodate side sleeping. https://www.rei.com/product/228442/nemo-riff-15-endless-promise-down-sleeping-bag-mens A few other things to keep in mind: - A great bag is useless without a pad. Make sure you factor that into your investment if you haven’t already. - A 20 degree bag might keep you safe in 20 degree weather, but you won’t be happy about it. I want a 0 degree bag if camping in anything below freezing. (But I am a small-ish woman who runs cold.)

I have had a nemo disco 15 bag, two EE and now a Zenbivy 10 degree light bed with half sheet. The Zenbivy is by far warmer than EE and to the moon and back more comfortable than EE and the Disco. I was skeptical of Zenbivy but it is a quality product. I use a Ultra 3R exped pad for three season and a 5R in cold season.

Get a disco 15 from Nemo. Only use kelty in the summers.

I have a disco 15 and love it. Alternatively you can get a fleece bag liner to add some warmth that way instead of a whole new bag.

hi!!! i am a lady and have the disco 15.  i am in love with it.  your wife might like this one- you can unzip gills if you get too hot though i never over heat in mine.  so squishy 

I think your pad is a bit over the top for the Rockies for 3 season but too much is better than too little. I use a 15 deg Nemo Disco 650 down had it for five years and have its perfect. I’m about to hand it down to my son and buy the new version, might splurge for the 800fp just to save to 100g! I do take thicker base layers in the late season.

If you’re fine with a mummy bag get the Coda, it’s a bit lighter and warmer. I got the disco as I’m a side sleeper, I find the extra room makes a difference for me. I haven’t tried a quilt and probably never will, drafts are a thing and the weather in the mountains can change drastically, I know I’m good in a bag. I misspoke before, getting the Riff to replace the Disco. Riff basically a lighter disco.

Your sleeping pad is fine albeit a bit heavy. I’m not familiar with Nordisk products but very familiar with Nemo. Given your budget I’d go with the Nemo Disco instead of the Riff. I’ve used a Nemo Disco 650 fill 15degF bag backpacking in the Canadian Rockies for seven years and I can wholeheartedly recommend this bag. It’s warm enough for three season camping to below freezing temps (with the right base layer) and I’ve even used it winter camping down to -10degC. Yes, you want hydrophobic down as in certain weather you’ll get more condensation inside your tent. I’m upgrading to the Nemo Riff as I’m handing down my Disco to my son. The only advantage of the Riff’s 800 fill down is it’s slightly lighter and should be slightly more packable. I’d get it if your budget allows but honestly I’d get the disco and use the savings towards a lighter sleep pad or some other gear upgrade.