I use a 5 gallon [US not Imperial] paint bucket and marked it on the inside with a 4 liter and 5 liter level. But Canadian Tire, how prefect! All the Canadians spend their Saturday mornings there for some reason.
Whereas the 'Mericans are at Harbour Freight.

Canadian Tire has more of a presence in Eastern Canada then here - I rarely go there or buy from them.
Their website is a good Canadian source for grabbing illustrative examples of thing like pails.