A size adjustable box is disclosed herein. The size adjustable box includes a plurality of box sections slidably adjustable relative to one another, the plurality of box sections configured to collectively define a box interior and an upper box rim; and a plurality of lid sections slidably adjustable relative to one another, the plurality of lid sections configured to be received on the upper box rim so as to generally enclose the box interior. The slidable adjustability of the plurality of box sections and the plurality of lid sections allows a user to adjust an overall size of the box.