A bike thief would have grin on his face when he approaches your bike thinking that he just got himself a free unlocked bike and a free water bottle. Imagine his face when he finds out that your bike is actually locked. Kuat bottle lock is actually a bike lock that camouflages itself as a stylish water bottle. Inside this bottle, you’ll find 5’ internally coiled 8mm cable that locks back into itself. Kuat bottle lock also features a compartment underneath for storage of your keys and other stuff. Forget the hassle to carry your lock and other items while riding, using this product, you can be sure any potential thieves will still end up on foot. However, this also means you still have to carry your real water bottle 
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From : Küat Innovations
Great concept!