In reply to Ricky Martin:
Jadias: please don't carry your lock over your shoulders! Unlikely, but strangulation potential * i've seen horrible bruises when people fall off. Not awfully likely, though..
What are you carrying? you can roll a suit & carry it in a rucksack if it's tall enough. a 'proper' PVC A3 size courier bag can carry a suit folded only once.I don't thing you can get a suit in any other courier I've seen.
I love my crumpler courier bag for small stuff, not as sweaty as a rucksack; a rucksack is better for shopping.
if it's just a shirt, laptop, i'd probably use a courier bag & a pack-it folder. I cycle slowly
. You can do more with a rucksack [slack off the straps to make it a bit less sweaty]. You're gonna get sweaty anyway?