I got sent a link to 'hot new camping accessories' and one of them was the Towbag which looks quite interesting. Not for sale yet though, and no projected price available. I am thinking a trailer will be what I get next because I don't get on well with roof boxes and we can't carry on having every spare cubic cm of the car crammed with stuff when we head off on trips.
It does strike me as an idea slightly similar to the clip-on crate excitement from last year though. Did it ever get off the ground (as it were?!) - who was it on here that got sent one to try?