Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Ruptured within first week of use!

My boyfriend has owned the identical item for 12 years and has never had a problem with it. I micro-waved the pack for 2 minutes and 40 seconds (the same amount of time we have always used to micro-wave the older pack), and one of the seams burst. This happened after only half a dozen uses. It's frustrating because I otherwise like this product.