Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Useless

This product is pretty much useless. After reading the great reviews I was tempted to buy the Fizz-Keeper, so finally I bought it. When it arrived, I put it into use immediately, only to be very disappointed by the results. The Fizz-Keeper did nothing to aid the soda into going flatter on me, and after I pumped it up, I could hear the hissing of the air escaping from this product. I also took a look at the back of the packaging and found out that it was made in 1987, maybe 22 years of being store somewhere away without any use made this product perform so bad? Who knows, maybe it was just the unit that I got that was so bad, but to me the results were clear that Fizz-Keeper did not do what it was promised to do.