We bought 2 (2 colours) partially based on reviews on the purple one that said they didn't leak and were fine “rolling around in the car”, but in use my purple one leaks around the rim and this morning have discovered the black (rolled around car while travelling and since hanging on the the back of the pantry door for a month but never actually been used!) has since cracked on the outside near the top. Would still hold drink as the inner is metal, but may affect how efficient it insulates. Not the quality I expected.