It looks like a water bottle, but it's not. Coiled inside is five feet of 8mm braided steel cable -- enough to secure your bike's frame and both wheels to a bike rack, lamp post or other immovable object. Includes two keys and a handy storage compartment.
"Water bottle" with internally coiled 8mm braided cable locks back into itself
Pull cable to extract, twist top to retract
Long enough to secure frame and both wheels
Bottom compartment for stowing keys or other small items