Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't make the same mistake...

I brought this stainless steel vacuum bullet to enjoy my hot, wholesome ginseng tea during my long, tedious lectures. From the appearance, this vacuum bullet is very appealing; however don't let this mislead you.Only if they showed the stopper of this vacuum on Amazon. The stopper is poorly designed, .... It has one rubber washer to hold the stopper, which is highly ineffective. .... Well, this was a waste of [money], so please reconsider. I hardly write reviews, but this product truly [upsets me] since more hot tea got on me then in me. -sigh-, I hope I have better luck with another brand.