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The twist-in locking straw is the feature I didn't know I needed — it hasn't popped out once since I started using it in the car. The wider straw opening really does make sipping easier, especially compared to the skinny straws I've dealt with before.

I fill my 30oz tumbler before a two-hour lecture and the twist-in locking straw means I'm not constantly re-seating it between sips. The airflow valve really does make a difference too, no annoying gurgle or resistance when I'm drinking fast.

The contoured straw is wide enough that I can actually sip without pursing my lips, which sounds small but makes a real difference on long drives. Twist-in locking straw stays put even when I tip the cup sideways in my bag.