A Gardner quote is built from the container, the load and the destination, and the middle one usually moves it most.
Size first. Guessing small and ordering twice costs more than one container of the right size, and we would rather size it correctly up front.
Density next. A three-layer shingle tear-off on an older Gardner two-family, horsehair plaster from a 1900s remodel, or a broken granite step can all reach a weight allowance while the container still has room above the rail.
Material routing is the third piece, and it is specific to this state. Because metals, clean wallboard, asphalt, brick, concrete and cardboard cannot be buried or passed along for burial in Massachusetts, a mixed load is sorted at a processing facility. That work is real and it shows up in the price, which is why a clean concrete or clean wood load priced on its own is often the cheaper way to run a job.
City rules round it off. Gardner's own drop-off site takes household material from residents only, and city crews do not take construction or repair waste, so a container is the practical route for anything bigger than a car trunk. Your account manager will quote the mix once you describe it.