Vacuum insulation helps to retain the temperature of food BPA free material construction meets requisite health standards Stainless steel built makes it corrosive-resistant The Ms. Bento Stainless Lunch Jar contains a washable container, two microwaveable inner bowls, chopsticks, chopsticks holder and easy-to-carry bag. Its vacuum insulation keeps foods hot or cold for hours. Large tote bag can also hold beverages and snacks. Large tote bag can also hold beverages and snacks Heat retention after 6 hours: 127°F (53 C) based on water at a starting temperature of 203°F (95 C) at a room temperature of 68°F (20 C) Cold retention after 6 hours: 52°F (11 C) based on water at a starting temperature of 40°F (4 C) at a room temperature of 68°F (20 C) BPA fre.