Abstract: A self-adjusting bumper comprising slidably adjustable upper and lower tapered nylon wedges for eliminating rattle space between objects and their containers. A tapered lower wedge comprises a dovetail guide rail and opposing guide pin rails; a tapered upper wedge comprises a corresponding dovetail guide path and opposing slots shaped for insertion and slidable adjustment of the guide pin rails. Opposing helical extension springs secured to the sides of the upper and lower wedges minimize friction forces between the wedges as they slidably move relative to one another. External surfaces of the wedges may be contoured to accommodate the shape of the object and/or its container.