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I wasn't sure how much difference a straw design could make, but the contoured mouthpiece really does let you sip with almost no effort at all. The airflow relief valve also means I don't get that annoying gulping or sputtering at the end of the cup. Definitely glad I picked this one up.

I kept losing straws with my old tumblers, so the twist-in locking straw is a game-changer for me. The contoured straw really does make sipping feel effortless, and the airflow valve keeps the flow smooth without any annoying gurgling. This is my new go-to cup for work.

The wider straw opening really does make sipping feel effortless, and the valve keeps air from building up so there’s no annoying gulping sound. I’ve been using it daily for a week and the twist-in lock stays put even when I toss it in my bag.