Nappy bins are great. At the rate you'll be changing them they're a godsend! By the side of the changer, drop it in, turn the handle, done.
Nappy bin.
All this lol
My dad bought a second hand second stage seat for transporting ours around. And then put a piece of 1" chipboard under it so it didn't mark the seats! I had to ask him what he thought the chipboard might do if he went from 40 to 0mph in a bump.