Abstract: A method and apparatus for sterilizing containers using hydrogen peroxide vapor is disclosed. The apparatus for aseptically filling a container comprises a housing, a source of liquid hydrogen peroxide, means for providing a flow of heated gas, means for causing the hydrogen peroxide to mix with the heated gas thereby vaporizing the hydrogen peroxide, means inside the housing for dispensing the vaporized hydrogen peroxide, the means for dispensing the vaporized hydrogen peroxide including means for dispensing the vaporized hydrogen peroxide into the container, fill tube means extending into the housing for dispensing product into the container, means within the housing for sealing the container, and means providing for the passage of the container between the interior and exterior of the housing.