Most garbage cans (at least those in dense areas) in my town of Calgary have a little shelf along the top that can hold cans/bottles. I can't see them being used for anything other than holding cans for collection. In Alberta, there is a deposit for all beverage containers (milk, juice, beer, wine, pop/cola etc) so there are a lot of people that collect for a living. Where I grew up (Ontario), there is only a deposit on beer and wine, not juice/milk/pop etc.
