A method and device for sealing gas in a gas compartment-equipped bag, in which pressurized gas discharge outlets (47, 52) are provided in the distal ends of a horn (31) and an anvil (32) of an ultrasonic sealing device, and such horn and anvil used for ultrasonic sealing are also used as gas-discharging nozzles. The distal ends of the horn and the anvil are placed against a cutout (19) of a gas compartment (16) of a bag, a gas is discharged into the gas compartment from the discharge outlets, the films surrounding the cutout are being clamped by the horn and the anvil while gas discharging is in progress, and then the gas compartment is ultrasonically sealed by the horn and the anvil to trap the gas inside.
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