I have and use this Lewis and Clark luggage lock. For one it attaches from your handle to the zippers that make it more difficult for someone cover their tracks if they pry open your zippers. You can also theater your luggage together or to seat at a restaurant.

I don't have this other lock but I believe it will work also to secure you luggage together.

Shak


http://www.amazon.com/Travel-Accesso...+luggage+locks

http://www.amazon.com/Kryptonite-998...ref=pd_sim_a_2