A truck bed extension system, includes a truck bed; an extension, having a frame with a first sidewall and a second sidewall; a base extending from the first sidewall to the second sidewall; and an interior cavity formed by the frame and the base; a mounting apparatus, having a first rail mounted to the first sidewall; a second rail mounted to the second sidewall; a first slide mounted to a first truck bed wall; and a second slide mounted to a second truck bed wall; the first rail is in sliding communication with the first slide; the second rail is in sliding communication with the second slide; and the extension slides into the truck bed via the mounting apparatus.