A divided container system comprising a master tray having an interior portion and a peripheral top edge, at least one insertable sub-tray positionable within the interior portion of the master tray, wherein each sub-tray includes a peripheral top edge and an interior portion, and a lid for sealing both the master tray and the at least one insertable sub-tray. The lid comprises an upper surface, a lower surface, a plurality of sealing surfaces extending from the lower surface of the lid, wherein the sealing surfaces are arranged to abut with the peripheral top edge of the at least one insertable sub-tray to thereby seal the interior portion of the at least one insertable sub-tray from the interior portion of the master tray, and a peripheral sealing surface for sealable contact with the peripheral top edge of the master tray.