Lock for carton bottom

A paperboard container formed from a unitary paperboard blank, the container having sides which are defined by two length panels and two width panels, each of said panels having an upper and a lower edge and being generally rectangular, major bottom panels foldably secured along straight hinge connections to said lower edges of respective said length panels, minor bottom panels foldably secured along straight hinge connections to said lower edges of respective of said width panels, said bottom panels forming a bottom for the container, each of said bottom panels being interlocked with two next adjacent said bottom panels, said two major bottom panels being substantially coplanar, each of said major bottom panels having a pair of spaced openings, each of said major bottom panel openings spaced from respective major bottom panel straight hinge lines, each of said minor bottom panels having free ends, said free ends provided with outer corner locking tabs, said locking tabs engaged in respective said major bottom panel openings, at least a part of each of said major bottom panel openings intersected by a respective slit which extends substantially normal to and adjacent to a respective said major bottom panel hinge connection, each of said minor bottom flap outer corners locking tabs forming a hook engaged with a respective edge of one of said slits exposed by displacement of said slit edges upon insertion of said locking tabs into respective said major flap openings thereby preventing accidental retraction of said tabs from said major flap openings.