Embodiments of foldable containers, such as foldable, plastic, produce containers, planar sheets used to create such containers, and related methods. In some embodiments, a substantially planar sheet for folding into a three-dimensional container may be provided comprising a plurality of side portions, each side portion comprising opposing flaps positioned on opposite sides. Each of the side portions may comprise opposing flaps, some of which may comprise tabs extending therefrom to be used for coupling with an adjacent side portion during a folding process. One or more of the side portions may also, or alternatively, comprise a stacking tab and/or a stacking tab receiving opening. The stacking tabs may be configured to be positioned within a stacking tab receiving opening of an adjacent container after the sheet has been folded into a three-dimensional container.