Here's a great little Carabiner style combination lock that works very well for securing your stuff. It's called "HelmetLok" from Rocky Creek designs. <> Use it to lock up basically anything that you can loop it through. <> Set your own combination <> Fits in your pocket or hangs from your belt loop when not in use <> The model we sell is Rubber coated so it won't scratch up your bike. <> The addition of this compact coiled cable that may be used to thread through jackets, gear and ratcheting style helmet straps. <> While this cable may not stop dedicated thieves, it works well in a pinch to keep not so honest people, honest and your gear with your bike.