I'm in the process of making a boot crate for my MK2.
It will consist of a clear, plastic crate with holes drilled down all 4 sides at various levels in order to hook bungee cords in them to keep things like oil and a water spray bottle upright.
I'm going to put sticky backed felt on the bottom in order to make it a bit grippy so it doesn't slide around.
Crude and cheap, but that's what I'm doing.