I filled it 3/4 with a cleaning solvent and drove to a location. It did not leak, and I don't think it will. However, it does dribble. So, when I arrived and started to use the bottle, there was some dribbling on the side of the cap. It cleaned up fine, and when I arrived home, it had not leaked. Good price, the right size for me, it did not leak during travel. So for me, it is a winner since size and not leaking when carrying it were the key requirements.