I purchased this five years ago. I used it for five winters. I am selling it because I no longer use it. The insulation function is normal. It is a stainless steel insulated lunch box. It is a lunch box that can keep food hot or cold. The gasket on the lid of the soup container (in the 7th photo) has deteriorated and become loose. Please be aware that there is a possibility of leakage if the gasket is not properly seated. The chopsticks are not included for hygiene reasons. This is a used item, so please refrain from purchasing if you are sensitive to such things. If you wish, I will also include the chopstick case. - Dishwasher safe: Yes - Washable: Yes - Microwave safe (containers): Yes Thank you for looking.