The ornamental design for a utilitybag, as shown and described.
FIG. 1 is a perspective view of a utility bag.
FIG. 2 is a front view of a utility bag.
FIG. 3 is a rear view of a utility bag.
FIG. 4 is a left side view of a utility bag.
FIG. 5 is a right side view of a utility bag.
FIG. 6 is a top plan view of a utility bag.
FIG. 7 is a bottom plan view of a utility bag.
FIG. 8 is a perspective view of a utility bag showing the utility bag partially unzipped and containing a rectangular object; and,
FIG. 9 is a perspective view of a utility bag being held by two users.
The rectangular object shown in broken lines contained within the utility bag in FIG. 8 and the users illustrated using broken lines shown in FIG. 9 are for illustrative purposes only and form no part of the claimed design. The broken lines shown on the body of bag and straps throughout the drawings represent stitching, which is illustrative only and does not form any part of the claimed design.