FIG. 1 is a front elevational view of a bra strap holder showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is an isometric view thereof, the broken line showing of the the bra is for illustrative purposes only and forms no part of the claimed design.