heya,

i've been using handcuffs for a while now and can't talk them up enough. they're small and easy to fit into your packet - no need for a bulky chain.

here's a pic of it in use here: http://www.markrobertallen.com/2007/03/out-and-about-round-valley.html#links

I'd advise against handcuffs... they are an incredibly easy lock to pick. Seriously, grab something thin and stiff (like a hairpin), stick it in the lock at a sharp angle, and twirl it in a full circle. There's good odds you'll release the lock.

Handcuffs are made for keeping people restrained while under supervision. They are not made to prevent casual theft.