The ornamental design for a laundrybagframe, as shown and described.
FIG. 1 is a perspective view of a laundry bag frame of the present design;
FIG. 2 is a front elevational view of FIG. 1;
FIG. 3 is a rear elevational view of FIG. 2;
FIG. 4 is a top plan view of FIG. 2;
FIG. 5 is a bottom plan view of FIG. 1; and,
FIG. 6 is a left side elevational view of FIG. 2, the right side elevational view is not being shown as this view is the mirror image of the left side elevational view.