if you're not going to load it too heavy, the Pinnacle at ~ 70-75 liters does a good job of eating up bulky winter gear, I added a light frame to mine in case I end up carrying snowhoes or the like- carrying snowshoes and a shovel I'm still under 30 #'s for a 3 day outing
as one of the posters mentioned, shelter weight (and volume!) can vary pretty wildly in the winter from a pyramid @ 2#'s to 9#+ for a heavy duty Hillberg or the like, that will most certainly influence your pack choice
you probably guessed, but I'm using a 2# pyramid :)
that's my wife's diminutive pack in the background, have to keep hers extra light!!!!