NEMO - Celesta 25 Synthetic Sleeping Bag

I love my down 15* Nemo bag. It's a huge warmth difference compared to my synthetic 25* Nemo.

Quilts, semi rectangular bags (Sea to Summit Trek and Ascent Down) or the Big Agnes Sidewinder series are what you want. The Nemo Spoon series of down bags are also quite roomy. I sleep on my side. I use Hammock Gear Econ Borrows most of the time and I have a Marmot Col -20F bag for anything 20F and below.

Which 2 in 1 are you referring to? The ones that come to mind would exceed your budget, but examples help.  What temperature are you expecting at night?  Mainly, I would suggest finding an insulated sleeping pad with a stated R-value. Depending on how cold it will be, the R-value changes (higher R for colder temperatures). For sleeping bag, add at least 10°C, so for example, if you expect overnight temperatures around 5°C, find a bag rated for -5°C.  I have a Nemo Quasar insulated pad in the double width (I move a lot), and a Nemo sleeping bag (in their "spoon" style because I can't sleep in a mummy style bag). 

I like the spoon shape of the Nemo bags. And, I’m currently using a wide deluxe pad from Big Agnes.

I’m a stomach/side sleeper and love my Zenbivy quilt+sheet and their matching pillow system, but it’s quite an investment for a casual camper. I’d recommend looking for a cheaper quilt or even a rectangular sleeping bag on Amazon or Decathlon if you’re not looking to spend a lot. I was really unhappy with my spoon shaped Nemo sleeping bag. Even though it’s wider than a traditional mummy bag, it was still restrictive. There are a lot of other spendy quilt brands out there and most have already been reviewed on r/ultralight.

I have a cot also but would never sleep on it without a pad when it's cold. I need the insulation. I really like the Nemo spoon shaped bags to be able to move around but why not pile up thick blankets for your first time out before dropping the money on a good bag.

I vote for Nemo bags. I have 2 and love them. Perfect for side sleeping.

This. I hate mummy bags. I move too much in my sleep. My Nemo takes up a bit more space in my pack but it is so comfortable and a good night’s sleep, where I can fully roll around in my bag, is worth it. I will never go back to a mummy bag.

Nemo for sure

Spoon shape is great, arm zippers in the boost just seem drafty.

Nemo sleeping bag with REI 2.5 self inflating sleeping pad works for me.