The ornamental design for a knitbag, as shown and described.
FIG. 1 is a first perspective view of the knit bag showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a second perspective view thereof.
The broken lines immediately adjacent to the photographic area define the bounds of the claimed design, and form no part thereof. The broken lines showing the remaining of the knit bag are for environmental purposes only and form no part of the claimed design.