More than 45,000 volunteers from across the country are expected to take part in this year's event, which runs until September 23.
The national campaign is a joint initiative by the Vancouver Aquarium and the World Wildlife Foundation, designed to raise environmental awareness.
According to campaign organizers, more than 400,000 people have helped remove nearly one million kilos of garbage from Canada's shorelines since 2003.
Cigarettes and food waste are among the most common items collected -- but seasoned volunteers have seen it all.
Last year, a wedding dress, an Elvis costume and a kitchen sink were collected in Toronto.