I do think the hooded woobie concept has some merit as well.
I use the my whoobie, big Agnes pad, and the cheapo liner and easily take it 30 degrees. Its really sized down needed pack space.
I’m packed right now for another two night backpacking/scouting trip with the family. I am once again carrying breakfast for 7 for both mornings. Supper for 7 for 2 nights. My lunches and snacks. Two stoves. Two big fuel bottles, a 10 liter katadyan camp filter, a cooking kit that includes a 10” skillet, my 4 season tarp, my whoobie, bag liner, a large Kifaru pullout of everything camp might need, my personal camp bag, etc…. Anyways, It all neatly fits into a DT3. With nothing in the side pockets.
It’s only supposed to get down to the low 40’s. But, if not for the whoobie, I’d have to carry my 20 degree quilt like I did last weekend. Which would ensure I’d need my DT2.
If you are familiar with these bags you can get a good idea how much space this saves. There’s roughly 2000 ci difference. I did trim down the luxuries I carried for the grandkids as well last trip. So, the savings obviously weren’t all due to the whoobie versus the quilt. But, my pack weight is 26.4 lbs with a liter of water. That’s awesome compared to 51 last weekend. A bigger bag means you carry more crap for the kids and wife.
FWIW, my “whoobie is really nothing more then an apex blanket like my. warden uses. It doesn’t have a hood. It’s not needed unless you don’t carry a beanie.