They're all sold out, Dan. I've checked.

You raise a good point though, and loath as I am to talk about it I do wonder whether we've reached a point of no return with respect to backpacks on tubes. They've crept up on us, the backpack wearers, and what started as a trickle became a wave so now I don't even know if the majority of commuters recognise it as deeply anti-social.