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I was worried the airflow valve would make it gurgle, but it actually lets me chug water way faster than my old straw cup. The wider contoured straw opening fits my mouth perfectly and I don't have to work hard to get a sip. Been using it daily for two weeks and it hasn't leaked once.

The twist-in locking straw is a small thing but it means the straw doesn't pop out when I'm carrying it around, which happened constantly with my old cup. Only gripe is the covered top takes a bit of a tug to get off.

The contoured straw really does make sipping easier, I barely have to tilt the cup at all. The airflow valve keeps things moving without that annoying gurgle. Only wish the covered top snapped on a bit tighter, but it hasn't leaked in my bag yet.