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The twist-in locking straw actually stays put, which was my main gripe with other cups. Sipping takes way less effort thanks to the wider opening. Been using it daily for a week and no leaks so far.

The contoured straw is wider than my old cup's, so I actually get a decent sip without puckering up. The airflow valve makes a real difference too, no gurgling or fighting to get water out. Been using it daily for a couple weeks and it hasn't leaked once.

The twist-in locking straw stays put even when I knock the cup over, which my old tumbler never managed. Sipping takes almost no effort thanks to the wider opening. I've been using it daily for about two weeks and it's become my go-to.