The ornamental design for a messengerbag, as shown and described.
FIG. 1 is a perspective front view of a messenger bag showing our new design.
FIG. 2 is a perspective back view of the messenger bag.
FIG. 3 is a front elevational view of the messenger bag.
FIG. 4 is a back elevational view of the messenger bag.
FIG. 5 is a top elevational view of the messenger bag.
FIG. 6 is a bottom elevational view of the messenger bag.
FIG. 7 is a left side elevational view of the messenger bag.
FIG. 8 is a right side elevational view of the messenger bag.
FIG. 9 is a front elevational view of the messenger bag in an open position; and,
FIG. 10 is a back elevational view of the messenger bag in an open position.
The lighter broken lines depict stitching and are part of the claimed design. The bold broken lines showing the zipper pull are for the purposes of illustrating environment and form no part of the claimed design.