Yes, the LEEZA bottle does not leak. It is important to make sure that the closing mechanism of the lid really clicks when closing it. When the bottle is closed correctly, a clear "click" sound can be heard. To be absolutely sure that the bottle is closed and nothing can leak out, you can simply turn the bottle over briefly (lid down) to check that no liquid is leaking out. If liquid does leak out, the seal in the upper part of the lid should be checked. It may have been displaced when the bottle was cleaned, so that it is no longer firmly seated in the lid. Once the fit is corrected, the problem should then be solved.