I have an Osprey. I like it for fall and spring (and warm winter), except for (a) the bulk and (b) the way my rought feet has "abraded" the fabric in the bottom of the bag (it looks like they have snagged the fabric and torn out little loops of thread). I'm getting a bit worried about how it will survive in the long run. Apart from that I really like it, too warm for summer, but when the temps will be around -15 -- 0 C it is my pick.
Actually, my old Carinthia Survival One winter bag is getting a bit old (I was chilly at -35 C this past winter), how is the Canada Jay? it looks like either that one, or a goose down bag (there are rumors of a Polish outfit that does good custom work for decent prices; I want a center zip bag rated -40 C).
Oh, and the compression bag is a chinese boat, was it too hard to let the straps cross over the opening? Luckily an old Ajungilak bag fits...