The Kuat Racks Bottle Lock is a bike lock that has the form of a water bottle
Bike locks ... they’re very necessary items, but are sometimes a hassle to carry when you’re riding. U-locks can be clipped into a frame-mounted bracket, but not everyone wants a big plastic bracket permanently installed on their prized two-wheeler. They can also be stuffed in a backpack, although that can be a challenge if space in said backpack is already at a premium. Alternatives include a lock that you wear like a belt, and a lock that straps onto the bicycle’s top tube. Now, there’s another option – a lock that has the form of a water bottle, so it can sit in your bottle cage.