Swiss Military Bento Box Stainless Steel Lunch Jar, Silver Vacuum-insulated stainless-steel construction keeps food warm and cool Double walled stainless steel thermo lunch boxes that can keep food hot for 6 hours. Vacuum layer. with 3 containers inside. Main Box : diameter 3.4in, height 5.3in, 15.9 oz and 6.8oz x 2 Includes convenient carrying bag for transport