Rucksack for Brompton ?

GuidonTheBee

Does anybody have any suggestions for a good bag to carry a folded Brompton in ? I've seen the B Bag but I was wondering about a rucksack style bag which might keep my hands free(er) than an over the shoulder ? Ideally I want to not have to use my hands so as I can carry shopping, etc

Or is the Brompton still too big/heavy/wide to really be sensible in a rucksack & I should just go for the B Bag ?