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

I love this thermos. I would love it more if it was not made in China. I fill the thermos with the hot water while I heat my lunch. My food is steaming hot 6 hrs later. One warning, be sure to empty every night. I filled mine one time and did not eat the food. They had a party at work and fed us. I then forgot to bring home my Stanley and clean it out. The next night when I opened it the stopper SHOT OFF and cracked. The food inside had spoiled and fermented. I have ordered a new stopper from Stanley and will be more diligent in the future.