This is probably the most stress-causing question you may have, but rest assured it is not as stressful as trying to determine what to dispose of first.
The short answer is: “I don’t know, either.” Needless to say that does not mean I don’t have answers for you. I have the best answer: pay for what you use. My boxes are “metered”. That is a fancy name for I have lines in them. One line is at six cubic yards another is at 15 cubic yards and the full can is 20 cubic yards. So, 3 boxes in one. By the way, that makes my inventory control easier. I either have roll-offs available or I don’t. I don’t need to sort through 3 different sizes. I just look out my window.
So, how big is the roll-off, you may ask? My cans’ are a driveway friendly design. They are 14 feet long, 8 feet wide, and 6 feet tall. They will even fit in parking spot!! (Yes, I know if you multiply those measurements they are closer to 25 cubic yards, but let’s keep that just between us.)