I claim the ornamental design for a trash bag, as shown and described.
FIG. 1 is a front elevation view of a first trash bag, the back view being identical;
FIG. 2 is an enlarged detailed view of the encircled portion in FIG. 1;
FIG. 3 is a front elevation view of a second trash bag, the back view being identical;
FIG. 4 is an enlarged detailed view of the encircled portion in FIG. 3;
FIG. 5 is a front elevation view of a third trash bag, the back view being identical; and,
FIG. 6 is an enlarged detailed view of the encircled portion in FIG. 5.
The semicircular broken lines illustrate a gap for a drawstring and form no part of the claimed design.
The circled dash-dot broken lines are included to show an enlarged portion of the trash bag and form no part of the claimed design.
The breakaway portions shown in straight dash-dot broken lines and in brackets show the trash bag has no specific length and form no part of the claimed design.