I have the Montbell Breeze Dry-Tec bag cover in wide/long, and it fits over my -5F WM bag, which lofts to about 7 inches.
However, my bag is the discontinued Aiguille, which is narrower than the current Kodiak. Eyeballing my setup, I think it would take the wider Kodiak, but the -25F Puma, lofting to 9 inches, might result in compression of the sleeping bag.
I emailed montbell for advice on the sizing of the bag cover and they were very helpful.
I don't have much experience with other bag cavers.