Instruct: Classify the given review into positive or negative sentiment.
Query: Unsanitary

Never have I been steered so far wrong by Amazon reviews -- I cannot believe people actually like this thing. Read the one star reviews: THE SEAL AT THE TOP OF THIS CUP LEAKS. What ever you are drinking will ooze into the cavity between the thermal layer and the outer shell. It will grow rancid and fester, and then it will ooze back out into whatever you are drinking weeks or months later.Seriously needs to be taken off the market.