The ornamental design for a binderspacer, as shown and described.
FIG. 1 is a perspective front view of a binder spacer, in a folded position showing my new design;
FIG. 2 is a perspective back view in use on a binder in an expanded position thereof;
FIG. 3 is a top view (bottom view is same image) in use on a binder in a closed position thereof;
FIG. 4 is a front closed view thereof;
FIG. 5 is a back closed view thereof; and
FIG. 6 is a back side view (opposite side view is same image) in a closed position thereof;
FIG. 7 is a top view (bottom view is same image) in a closed position thereof;
FIG. 8 is an isometric front closed view thereof;
FIG. 9 is an isometric back view in a closed position thereof;
FIG. 10 is an isometric back view in a partially open position thereof; and,
FIG. 11 is an isometric back view in a fully open position thereof.
The broken line showing of elements in FIGS. 1, 2, and 3 is included for the purpose of showing environmental structure of the binder spacer and forms no part of the claimed design.