Tongs for sealing an opening of a bag includes a first body having a first side, a second side and a third side connecting the first and second side, and a second body having a first side, a second side and a third side connecting the first and second side. The first body and the second body are configured to be combined with each other, so that the first body and the second body cover a surface and an opposite surface of the bag configured to cover and seal the opening of the bag.