In reply to el diablo:
Not much use to you, but our youngest has a Big Agnes bag - it's a synthetic half bag, with a sleeve that the thermarest slips into. This means he can't slip off the mat in the night, is fully enclosed but can still move around, and the hood/collar means no cold spots. Being synthetic it is cleanable relatively easily if need be, and despite being synthetic as it is only a half bag it packs down to the size of a normal 2/3 season down bag.
https://www.bigagnes.com/Products/Detail/Bag/littlered152016
cheers
b