The ornamental design for a dualbag with a white inner bag and a blackouterbag, as shown and described.
FIG. 1 is a front perspective view of a bag that includes a white inner bag and a black outer bag;
FIG. 2 is a front view of the bag of FIG. 1, the back view being the same as the front view; and,
FIG. 3 is an exploded view of the bag of FIG. 1, showing the white inner bag and the black outer bag.
The broken lines in the drawings illustrate portions of the dual bag that form no part of the claimed design. The bracket showing broken away portions illustrate the bag has no specific length. Where a broke line box is indicated, material inside the box is part of the claimed design.