Your smartphone is a natural partner for your bike, especially if you're serious about commuting or training — most phones come with a flashlight, and apps for training, navigating, and video. The Handleband ($25) is a flexible smartphone mount for your bike that accommodates a range of devices, gives you access to your phone, and allows you to position it within view or for use as a headlight (it even has a built-in bottle opener). It's made from aluminum and premium silicone, so it's durable enough to handle just about any terrain, and flexible enough so you can easily remove it.