[bombcar]

It also depends on how many trash cans are around. If there are a few (and you know where to get to them) a bucket can be dumped multiple times.

Otherwise you want something bigger, preferably on wheels. Though you can do the classic where you fill bags and leave them by the road and come back later to pick them up in a vehicle.

You can even get permission from the city to drive down bike paths to pick them up, though a cart on a bike would probably work as well.