We understand that you need a sealed designed bento box to carry your lunch. We design it with tight sealing material to make sure 100% no leaking when bringing your lunch.PS: This bento box is not suitable to carry soup. We understand you may bring different kinds of food for your lunch. The separating design is really important. According to many of our customers, three separated compartment of lunch boxes are the most reasonable design. When you bring your lunch to your office, you can reheat it by Microwave. But make sure open the lid when using the microwave, as the lid is very tight with the box and the gas cannot come out if close it when heating. The size is only 8.4*6.1*2.9in. You can put it into your bag easily without worrying about leaking.