The ornamental design for the sock laundry bag, as shown and described.
FIG. 1 is a front perspective view of a laundry bag or sock laundry bag having a mesh open fabric defined by the multiple rectangles on the front and also showing 3 horizontal zippers on the front embodying my new design;
FIG. 2 is a rear view thereof having a sheer fabric;
FIG. 3 is a right side elevational view showing the vertical zipper;
FIG. 4 is left side elevational view;
FIG. 5 is a top view showing the top zipper in the open position; and,
FIG. 6 is a bottom view showing a zipper edge along the bottom for connecting to another zipper edge on another bag.
The broken lines shown on the sock laundry bag are included for the purpose of illustrating stitching and forms a part of the claimed design.