Originally Posted by
GlennR
On ride where I know i'll be out of sight of my bike, I bring a Abus cable lock. It's about the size of a deck of cards.
It won't stop a determined thief but it will keep honest people... honest.
http://www.youtube.com/watch?v=IpSIJ4Z1qc8
I use one like that too. Maybe even smaller.
It's just strong enough that normal scissors would not be able to cut the cable, but gardening shears probably could.