The Smartraveler 3-dial combination lock is perfect for frequent or casual travelers. Smartraveler made a lock that is sturdy enough to deter casual, or opportunistic, thieves while still allowing TSA to do a bag search without cutting your lock. Curious if someone opened your bag? Well, that's what the red plastic tab on the shank is for. If the lock is opened by a TSA Officer the red tab will pop up. So when you retrieve your bag, you will know. (Also, from my experience, TSA puts a notification card in your bag if it's searched.)

The main benefit of this lock is to deter airline baggage handlers and shady passengers from having a look through your stuff and snatching some valuables. I say deter because, really, these locks are pretty small and relatively weak. Keep in mind that all locks are vulnerable. If someone really wants to get into your bag, they will.

I like the yellow color because not that many people have yellow locks which helps it stand out on the bag claim carousel. I think these are worth the money.