The ornamental design for a dual chamberbag, as shown and described.
FIG. 1 is a top front perspective view of the dual chamber bag showing my new design;
FIG. 2 is a front elevation view thereof, with the rear elevation view being a mirror image thereof;
FIG. 3 is a right elevation view thereof, with the left elevation view being a mirror image thereof;
FIG. 4 is a top elevation view thereof;
FIG. 5 is a bottom elevation view thereof; and,
FIG. 6 is a top front perspective view thereof, shown in use.
The dual chamber bag is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design.
The broken lines in FIG. 6 showing the dual chamber bag in use illustrates environment and forms no part of the claim.