My oldest is 9 and he loves his Enlightened Equipment quilt but I know you said you want to stick with a bag. What we found that worked well was the big Agnes kids bag. They are synthetic but don’t have the insulation in the back of the bag. Instead, it has a sleeve that the slipping pad slides in so the bag/kid won’t slide off the sleeping pad. It is pretty neat.
Might consider cross posting at r/hikingwithkids
My kid uses an older big Agnes kids bag that has a sleeve for a standard 3/4 pad. My quilt is lighter than his bag, but his pad is lighter than mine.
I like that he can't spin in circles and bump into me at night and he sleeps in it fine. I've been using it for car camping and would consider going for Morrison if I didn't get a great deal of this bag but I really do like that he stays on the pad and doesn't wake me up.
I've used and kinda liked the Big Agnes kids' bags. They've got a pad sleeve, which mostly solves the "kid curled up in the corner of the tent" issue. The ones I bought aren't available anymore, but they were 15F rated and okay down to freezing (maybe lower -- didn't try it). The weight is slightly below 2 pounds, which is in line with the current offerings. That would be heavy for an adult's bag, but my kids tend to carry their own bag, their pad, their own puffy, and that's about it.
I usually used CCF with the pads. For colder nights, ALPS makes some super-bulky, very thick CCF that worked well, although it winds up strapped to the top of my pack.
I wouldn't trust any of my kids to sleep properly in a quilt. The 14yo, maybe.
The Nemo spoon shaped bags, TR Boost or BA Torchlight are all nice and accommodating for flamingo type sleepers (I am one as well.)
Also consider a quilt!
Since it's currently at full price, the Magma is about $100 more expensive than either of OP's choices. The big difference is that has 800 fill power down, where the other two are 600 and 650 fill power.
My daughter recently replaced a synthetic bag she bought while in college with an REI model, and liked their new sizing system. I think she may have bought the REI Magma. I have and like a Big Agnes 650 down bag I've had for years, but at a 15 degrees F rating, it hasn't gotten a lot of use in recent years.
I agree with u/TheBimpo that, unless they are trying to put a full set of gear into a pack of 50 liters or less, OP will do fine with either of their choices.
bear843
