I have been using the western mountaineering ultralite for about 3 years now and love it. I ordered from moosejaw as they were the cheapest at the time. Great colder 3 season bag for sure as many reviews say.
I have a woobie and use it for exactly what you are looking for. It works well in colder weather with my western mountaineering ultralite bag and solo during warmer nights. You won't regret the purchase.
Excellent info, I own a couple pieces of the Kuiu line but had no idea they made a line for kids. I know what my son and daughter will be getting for Christmas. Much appreciated.
As stated above, looking for KU Koala Lite and KU3700 or KU5200. I'm 6'3" so need 24-26" stays and a medium belt.
Would also like some of the accessories like KU pullouts, etc as well if anybody is selling them.