Foldable and/or collapsible plastic/composite utility enclosure

An enclosure assembly, comprising:

• a foldable enclosure, the foldable enclosure comprising a plurality of sides, each of the plurality of sides having a first end and a second opposite end, wherein the first end of each of the plurality of sides is connected to the second opposite end of another of the plurality of sides, and wherein the foldable enclosure is movable between an unfolded position and a folded position;
• and
• a removable lid formed from a thermoplastic matrix, the removable lid comprising a plurality of first reinforcement ribs extending between a front end and rear end and between a first side and a second side and forming a lattice-type structure, wherein a plurality of second reinforcement ribs are mounted in spaces formed by the lattice-type structure, wherein the plurality of first reinforcement ribs are larger than the plurality of second reinforcement ribs such that the plurality of first reinforcement ribs extend to a greater depth from a bottom surface of the lid than the plurality of second reinforcement ribs, wherein the lid is constructed to withstand up to 33,750 pounds of force without breaking or being deformed.