The space on a bicycle is limited and any optimisation is always welcome. I commonly use water bottles but sometimes I just need my lock for small in town stops.
This cage integrates a holder for my U shape lock. It fits a lock diameter of 31mm (1.22in) for the body and a diameter of 15mm (0.6in) for the U shape. A tight slide fits and small features on the cage ensure a click fit and steady rest. It fits well my 76mm water bottle and will adjust quite well to other similar sizes. Use the step file and adjust to your need.
Note that it hasn't been tested on the road yet (there was still snow all over at the time of this post)
The author remixed this model.