Siesta Hooded 20 Double Sleeping Bag

The double Exped Megamat is awesome. I've zipped two rectangular Kelty bags together and that worked fine. Upgraded to the REI Siesta 20 double bag and quite like the pillow garage and adjustability. I usually have an additional blanket or two on top because I run pretty cold.

We got the REI Siesta 20 double bag and quite like it. We usually also bring an extra blanket in case it gets colder than we expect.

I've never been out at 20 degrees, the coldest I've camped in was overnight lows in the 40's. We pair our sleeping bag with a MegaMat Max (upgraded from the MegaMat LXW Duo). Certainly we've deployed the extra blanket a few times when it's been on the colder end, but it's almost always kicked off in the night as warmth equalizes between each of us and the sleeping bag/mat. I run quite cold (Reynaud's syndrome + perimenopause = world class kleptotherm) and my partner tends to run warm, so it works out quite well. The extra blanket that we've used has ranged from one of our rectangular bags to a down Rumpl to the extra blanket I keep at the foot of my bed at home. My biggest takeaway was that the Rumpl and extra rectangular sleeping bag as an extra blanket tended to slither off the silky double bag, and the sherpa fleece blanket from home tended to be the most useful. Many folks swear by wool blankets from the army surplus store! Before we got the REI bag, we used two Kelty rectangular bags zipped together, one 30 degree down and one 35 degree synthetic. I already owned the down bag, took it to REI and started zipping it into bags until I found one it was compatible with - no actual strategy behind choosing down vs synthetic. We did choose to put the synthetic one underneath us, as it's the easiest to wash at home. It worked well, and we still have the bags! The double bag was by chance as it was on sale and the warmer rating + the pillow garage were both features I was interested in. Hopefully a useful ramble!

https://www.rei.com/product/245459/rei-co-op-siesta-hooded-20-double-sleeping-bag Went with this in the 30°version and have a Chinese diesel heater & no complaints at all

we use the exped deep sleep duo mat (lw+ version) and a REI siesta 25degree double bag; we have two sets of these and we usually sleep one adult + one child, although I'm sure it would work for my wife and I (she's tiny 5'5", I'm big 250lb 5'10") the bag is rated 25 deg but for temperature control we just unzip the size to let airflow into the bag or to stick a foot or leg out we like the rectangular style bag because it's more roomy, it is also designed to unzip and become two separate bags if needed

I like our REI two-person sleeping bag when I have it to myself, but honestly we usually just bring cotton sheets and a lofted blanket that stuffs down into a small sack. That setup is the most comfortable for a range of temperatures and we’re fine with it down into the mid 40s.

REI Siesta is a bag that is stand alone or can be zipped together. I bought mine a few years ago…hopefully they can still be zipped together. They might be a bit bulky for backpacking but I’ve never tried to get one in a stuff sack. They are square (not mummy) and I found them to be very warm.

Eh, depends on your use case. I'm in Alaska and I use a 20 degree rated REI bag. But I'm also not camping in colder seasons. If I were going out anytime other than between May-October, I'd have a -10 rated down bag.