The ornamental design for a carrierbag, as shown and described.
1. Carrier bag
1.1 : Perspective
1.2 : Front
1.3 : Back
1.4 : Right
1.5 : Left
1.6 : Top
1.7 : Bottom
The carrier bag comprises a body that is open towards the top and has two ribbon handles; the ends of the handles are connected externally to the edge of the opening in the body and extend obliquely to the longitudinal direction of the handles; the ends of the bag body have a pattern consisting of a vertical strip and a triangle at the base, said triangle being connected to the lower end of the strip; the figures show, in sequence, the carrier bag in perspective view, front view, rear view, right-hand view, left-hand view, top view and bottom view.