You're right, either "split" will probably work just about as well as the other.

I'm pretty much sold on the roomier WM 15 degree bag for those cool fall nights (and cool early spring ones), because the WM 40 degree Mitylite bag is heavier, and, I think, shorter (I'm 6' and move a lot when I sleep) than Montbell UL SS Stretch 5 long.

I guess what I'd like to know next is whether the Montbell bags at the cooler end of the range are bags that most people would rate accurately. Is the Montbell U.L. 40 degree bag one that seems to experienced folks closer to 35 or 45 (granted, from their point of view)?



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