Blake Mills, an avid cyclist and entrepreneur, came up with The Helmet Lock, a simple little cable that secures your helmet to your U-lock or cable lock, saving you the hassle of having to carry it around when you park your bike.
You simply slip the big loop through a small or medium vent in your helmet, then loop it through your lock.  The rubber-coated nut holds your helmet securely.  Simple concept, solid execution.  He sent us a couple to check out and they’re very nice and very easy to use.  They’re now permanent accessories on the U-locks we use.
The Helmet Lock stores itself by double looping onto the lock.  Click the images to enlarge and see how it works.  For the weight weenies, there’s a pic of it on a scale after the break…
The Helmet Lock is $12.95 for one or $19.95 for two, and you can order directly from their website.