Modular container system having an interior dividable into compartments of variable size

A modular container system has an interior dividable into compartments of variable size and includes a base having a bottom and sidewalls extending from the bottom to define an interior volume. At least one opposing pair of the sidewalls have regions arranged opposite each other, each of the regions including protrusions to form pairs of opposing protrusions, each of the regions further including indents positioned in correspondence with the protrusions. At least one barrier extends between the opposing protrusions to divide the interior volume of the base into a plurality of compartments. The barrier has an elongate body and a tab portion extending from each end of the body. Each tab portion is bendable to orient an underside of each tab portion to face a respective protrusion, a longitudinal end of each said tab portion engaging with a corresponding indent, to form a press-fit coupling.