The ornamental design for a trashbag, as shown and described.
FIG. 1 is a front elevation view of the trash bag showing my new design, the back view being identical. The trash bag has no appreciable thickness; and,
FIG. 2 is an enlarged partial view of the encircled portion of the trash bag of FIG. 1.
The broken lines indicate the enlarged area of FIG. 1 shown in FIG. 2 and form no part of the claimed design. The dot-dash lines show no specific length and form no part of the claimed design. The cross-hatching shown in the lower part of the trash bag of FIGS. 1 and 2 discloses a contrasting surface from the remaining surface of the trash bag.