Title: awesome for a week or two!
Review: I was sooo happy to see such a great invention like this that I have purchased several. However after about a couple of weeks the seal no longer seals, and even just water will leak out all over. Now I just use them for a thermos type cup which of course will keep ice in water for nearly 12 hrs or so! Keeps hot drinks hot for a few hrs.Dont plan on the seals lasting. I've even returned a couple of them and they still didn't last.I now also have the new bulkier version and the seal has lasted for months, but it doesnt work as nicely from the point of view ease of use and ergonomics. The lip doesnt seem to quite seal completely all the time right away, which causes excess liquid to escape and leak a bit on the newer version also.
Is this product review negative?