Throwing a feeler out there. Im in the market for my two children 8 & 10. Prefer 4 season and ultralight - but, at the same time best bang for the buck.
My sons are 9 and 11. They needed sleeping bags with the same specs you are looking for. I bought them each a hyke and byke 0 degree Katadyn synthetic bag. These bags pack down small, are relatively lightweight, and are affordable. So far i really like these bags and will get one for myself too
Check out the Big Agnes Duster 15. Relatively light and it is adjustable for the kids size. I picked one up a while back on a great sale but haven’t been able to use it yet. Seems pretty nice.
Offering a customizable fit system, the Duster is a warm, cozy Big Agnes System bag that will grow with you lil camper from tot to teen. Shop today at bigagnes.com!