Here’s the Canadian scope. You are only allowed one litre returning to Canada. The connecting flight IN Canada,after customs, is the problem. Sometimes the luggage goes on through and we can’t get the duty free in a piece checked luggage.
So I go down to the China Man and buy the equivalent of 1L in those little tiny Mickie’s and put them in my checked luggage. They make great gifts and easy to pack going to the camp and going to hotels, etc. And it is the same amount as a 1L, I just redistribute it in my luggage better. Doesn’t work out to be any more expensive than duty free.