3.4L Stainless Steel Food Jar, Vacuum Insulated, Leakproof, Keeps Food Hot/Cold For Hours

VACUUM LONG LASTING INSULATION: Double layer vacuum insulation technology, long lasting insulation for 6 to 8 hours. For better results, please preheat or pre cool the food jar by pouring hot or cold water into it for 1 to 2 minutes before putting in the food. PRACTICAL: You can use it to carry soups or a variety of dishes so you can enjoy a richer, more nutritious lunch or dinner, which is microwave safe and easy to reheat.