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The twist-in locking straw actually stays where you twist it, so I'm not constantly fishing it back up from the bottom of the cup. And the wider straw opening makes sipping way less effort than my old tumbler.

Never had a straw stay put like this one does, the twist-in lock means I'm not fishing it out of the cup every five minutes. The wider contoured opening actually makes sipping easier too, less effort than my old tumbler straw.

The twist-in locking straw is the detail I didn't know I needed, no more straw popping out mid-sip. And the airflow valve really does make drinking feel effortless compared to my old cup.