Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Yeah not impressed

I dont know maybe I'm a moron and just couldn't figure it out but from my understanding the product's nipple is supposed to STAY filled but it doesnt. Mine always has negative space and bubbles - how is this supposed to HELP with reduction in gas?!?! I dont know. I dont like it though, I wish I could send it back for a refund as I am VERY unhappy with it.