Features:-Insulation technology for maximum temperature retention of hot or cold food. Tasty and independent of the weather. Keeps warm for up to 12 hours and cold for up to 12 hours.-The interior is made of 316 food grade stainless steel and the exterior is 304 stainless steel, BPA free, PVC free, non-toxic. High-quality materials ensure safety and food health.-Air pressure release design makes it easy to open. The bottom has a non-slip design to avoid falling on the floor. Silicone insulation ring to prevent food leakage.-You can use these insulated lunch containers to keep food warm & cold, such as fried rice, soup, pasta, salad, fruits, vegetables or even nuts.-Easy to fill, wide opening that is easy to clean. (Note: do not put in the microwave.) The.