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“Block” is the thinnest lunchbox in the market, it can be suitably fitted in briefcase instead of lunch bag. We all know that a briefcase is necessary for most of office workers. But it is inconvenient while they have to take a lunch bag together. Therefore, we designed the lunchbox into a thinner sharp. The thickness is only 3.5cm, the 4 side lengths are both equal to the width of A4 paper, so it can be fitted in briefcase easily. It's convenient for users in portability. In the meantime, the creation of the “Separation of sealing” technology makes sure that the food can be perfectly separated and the liquid doesn't leak into briefcase.