Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Life saver

My son decided somewhere around 2 that he doesn't like these wide bottles and he only likes the regular bottle. But when we travelled abroad when he was 9 months, these extra nipples and disposable pouches were a life saver with ever 3-4 hour feeding. Having enough to stay out all day without thinking about cleaning in a foreign country saved my wife and my sanity.