Mark Thompson wrote:

What are banned precisely?

If unicycles are banned then presumably the much larger rucksacks
are also banned. If not, why not?

snippity

Ok so you want them banned also?????

I think he mentioned them as a way of highlighting the idiocy of
banning a unicycle...

Why?

Do rucksacks also have hardened steel sharp bits sticking out and/or covered
in black grease as well?