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  • How are reviewers describing this item?
    great, good, proof, fit and open.
  • Our engine has detected that Amazon has altered, modified or removed reviews from this listing. We approximate total reviews altered up to 64.
  • Previous analysis of this listing was an C grade.
  • Our engine has profiled the reviewer patterns and has determined that there may be deception involved.
  • Our engine has determined that the review content quality is low.
  • Our engine has analyzed and discovered that 77.6% of the reviews are reliable.
  • This product had a total of 277 reviews as of our last analysis date on Mar 14 2020.


Most positive reviewquestion

Works great on the 30 oz stainless tumblers, high quality at a great price

Least positive reviewquestion

Not enough review data to provide meaningful insight.

Most authentic reviewquestion

Works as described, has a high pitched whistle when you drink from it, but it is only mildly annoying.

Least authentic reviewquestion

I like you can close it.

Helpful Insights


    Posted by a reviewer on Amazon

    Wouldn't totally trust the slide tab to stay closed tightly but for 99% of use it is fine.

    Posted by a reviewer on Amazon

    I was hoping for a little more spill proof, although this product is only advertised as spill resistant.

    Posted by a reviewer on Amazon

    I have noticed the same whistling noise that i read on previous reviews.

    Posted by a reviewer on Amazon

    Not 100% leak proof but definitely spill proof.

    Posted by a reviewer on Amazon

    Splash proof but not leak proof.

    Posted by a reviewer on Amazon

    If you hold it upside down it will leak.

    Posted by a reviewer on Amazon

    Remember that it's splash proof, not completely spill proof, but even when i've tipped my glass, very little liquid seeps out.

Review Count History
Price History