A telescoping insulated box assembly, comprising: an outer box, the outer box comprising a side wall and a bottom wall, the side wall and the bottom wall of the outer box each defining an insulation cavity; and an inner box, the inner box comprising a side wall and a wall forming a portion of a top side of the box assembly, each wall of the inner box defining an insulation cavity, the inner box sized to fit into the outer box such that the each of the side walls of the inner box faces one of the side walls of the outer box.