Fortunately, There are only a couple of places I hike that require a canister and both are short enough I've been able to avoid them. I'd have to change packs if I needed one. I also have the WM Ultralite, rated, I believe to 35 or 40 F. I've had it down further with all of my clothes on (but no vapor barrier). Don't know what the temperature was, but I had slush in my water bottle (left out accidentally).

Incidentally, I left out of my list the other day that my clothing bag is very light and almost waterproof. I use it as my pillow. When I have no clothes left, I fill it with leaves and duff. Works well. Also, left out one of the miracles of modern backpacking, hand sterilizer (used often, substantially reduces the trail runs)

best, jcp