Bento Stainless Lunch Jar Lunch on the Go Whether in the office or on the go, you can take a healthier, tastier, more interesting lunch with you thanks to Zojirushi's Mr. One of the most versatile lunch boxes you'll ever come across, the Mr. Bento lunch jar comes with four different containers that allow you to pack a multi-course lunch of both hot and cold items easily and securely. The jar itself is made of stainless steel, is vacuum-insulated and houses four plastic containers with lids. The large soup bowl comes with gasket-sealed lid to prevent messy spills and is specially insulated to keep soup hot. All pieces should be washed by hand with non-abrasive cleaning pads. Inner bowls are microwave-safe. A spork with its own protective cover attaches to the Mr. Bento lunch jar, and the jar itself has its own lid with lock and comes in a zippered carry bag with a strap for easy transport.