FIGS. 1 and 2 are different perspective views of the portable memory storage device according to the present invention.

FIG. 3 is a perspective view of the portable memory storage device in an open position;

FIG. 4 is a top view thereof;

FIG. 5 is a first side view thereof;

FIG. 6 is a bottom view of the portable memory storage device;

FIG. 7 is a second side view thereof;

FIG. 8 is a first end view thereof; and,

FIG. 9 is a second end view thereof.

The broken lines on the drawings are for illustrative purposes only and form no part of the claimed ornamental design.