Xreservoir is built to be rigid, durable and withstands even extreme temperatures, and are reinforced to hold up against the forces of nature. These lids are designed to fit the XReservoirs. Dimensions: 34" x 52". Xreservoir is built to be rigid, durable and withstands even extreme temperatures, and are reinforced to hold up against the forces of nature. These lids are designed to fit the XReservoirs.