Insulated Food Jars by Zojirushi. Details:Description Zojirushi began in Japan in 1918 as a manufacturer of hand-blown vacuum bottles. They are still known today for their high quality vacuum insulated products. This stainless steel food jar is vacuum insulated so it keeps foods (or beverages) hot or cold for hours. Durable and sanitary 18/8 stainless steel construction will not rust, tarnish or stain and will not leak harmful chemicals. The interior is polished stainless steel with a nonstick coating and is neutral to taste and smell. Tight -fitted lid has a gasket that seals lid to minimize leaks and maximize heat retention. It has a unique lid designed with a vent that allows users to release the pressure inside to make the lid easier to open when the food jar contains hot foods or beverages. A wide opening of 2 and one half inches makes it easy to fill and clean and allows user to eat directly out of the jar.