Disclosed is a box, a modular box assembly, and a method of assembling a box. The box can comprise a center panel defining a first side, a second side opposite the first side, a first end, and a second end opposite the first end; a first locking panel extending from the first side, the first locking panel comprising a pair of wings, each of the wings defining a locking slot; a second locking panel extending from the second side, the second locking panel comprising a pair of locking tabs, each of the locking tabs engaging a corresponding one of the locking slots; a first side flap panel extending from the first end; and a second side flap panel extending from the second end.