Are Chilly's Tumblers leak proof?

Chilly's tumblers are not leak proof.

The plastic lid of the Chilly's Tumbler allows for easy drinking and is splash-proof, however it is not leak proof. If the Chilly's Tumbler is knocked over or turned upside down it will leak.

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    I can confirm the tumbler is definitely not leak proof. It leaks both from where it fits onto the tumbler and also through the drinking open/close slider.

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