The MIKU MAX is technically a scooter, though one with an unconventional design. The frame is C-shaped, leaving a large hollow void under the seat. The idea is that you could use it for cargo storage, though I’d probably add some cargo nets to either side to keep all of my junk in place.
The nice thing about the oddly shaped open area is that you can carry much larger objects than in a trunk. Things like cardboard boxes, laundry bags, step ladders… you name it! If it can fit in the void and not cause a danger to other vehicles around you, you can probably do it.