I use mine in the winter, but I'm mindful of the vachetta on days when it's snowing or just outright gross (i.e. early spring thaw). I also pass on LV, or really any bag made or canvas or leather - regardless of brand, on the days when the temperature drops to below -25C because of the very real risk of freezing the material and causing it to crack. Nothing is really meant to handle those extreme temperatures.
Including us...
Signed RayKay in Canada