The ornamental design for the wine bag, as shown and described.
FIG. 1 shows a perspective view of a wine bag according to the present invention, wherein the broken lines are included for the purpose of illustrating a portion of the container that forms no part of the claimed design;
FIG. 2 shows a front side view of the wine bag of FIG. 1, wherein the broken lines are included for the purpose of illustrating a portion of the container that forms no part of the claimed design;
FIG. 3 shows a back side view of the wine bag of FIG. 1, wherein the broken lines are included for the purpose of illustrating a portion of the container that forms no part of the claimed design;
FIG. 4 shows a side view of the wine bag of FIG. 1, wherein the broken lines are included for the purpose of illustrating a portion of the container that forms no part of the claimed design;
FIG. 5 shows a top view of the wine bag of FIGS. 1; and,
FIG. 6 shows a bottom view of the wine bag of FIG. 1, wherein the broken lines are included for the purpose of illustrating a portion of the container that forms no part of the claimed design.