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I've literally tried all types of water bottles - from cheap to high-end. This is the only bottle that is consistently leak proof, even after hundreds of uses/washes. My only complaint is that the solid-colored bottles shed in the dishwasher (yes, I know you're technically not supposed to put them in the dishwasher but who has time to hand wash?). I have the blue one, and pieces of the blue film around the outside of the metal bottle come off. It took a year or so for this to start happening, but the bottle is now almost completely silver. It hasn't happened with to the bottles with characters printed on them.