We have two main dumpster sizes, 15 yards and 20 yards, but we also have smaller ones available including 8/10/12 yards.
These are "roll-off" style dumpsters, so they have a big open top and a door on one end that opens for easy access.
There is not a big difference in the footprint between the different sizes. Most dumpsters are 7ft wide and range from 10ft to 15ft long. Volume difference (capacity) is made up in the height of the sides which range from 3ft to 5ft.