Abstract: The invention comprises a truck bed liner for a vehicle cargo bed including a liner floor and four support members which are formed from the liner floor and protrude upward from the liner floor. Two pairs of support members are positioned such that a restraining member may be placed between the right support members and the left support members. The restraining member is held in place by the support members and therefore compartmentalizes the cargo area and provides a mechanism to restrict or inhibit the movement of small or oddly shaped items within the cargo bed without reducing the width of the interior cargo area.