You say your clothes are optimized… but Nemo jazz is a 30deg bag and I’d be shocked if you tried a zero deg quilt with the right layers and couldn’t make it work.
I find my 0deg quilt plus alpha fleece and wearing my (dry) rain gear is good well below freezing even cowboy camping with a breeze.
But you gotta practice and iterate.
TLDR: the bags/quilts you tried might not be your problem.
Ok so it’s important to know that the degree rating on bags is the survival rating. This is the “you probably won’t die of hypothermia, but you’re not gonna have a good time” rating.
Rule of thumb is to add 10-15 degrees F to any bag rating for the comfort rating.
Always err on the side of caution with colder temps. If you get warm, you just open the bag. Some bags even have vents (my Nemo bags do).
There are some tricks to stay warm with a bag, but for high 20’s, get at least a 15 degree rated bag. And have your son bring some good under layers to sleep in as a caution.
Top Outdoor Sleeping Bags on Reddit
1
NEMO
Disco 15 Series
79% positive of 114 users
Spacious for side sleepers; bulky, temp rating optimistic.
1ntrepidsalamander
