Changes

It can be a problem when you travel from warm to cold zones or the other way around (and you like to travel light with little luggage), e.g., from South Iran to Turkey in winter. However, traveling from cold climate zone to a warm one seems to be less of a problem as when you get to the warm zone you can just ship your winter stuff back home. Nevertheless, it does not have to be costly or implies heavy luggage to travel the other way around.