There is a tendency to utilize underground space for the less ornamental purposes of civilization; there is the Metropolitan Railway in London, for instance, there are new electric railways, there are subways, there are underground workrooms and restaurants, and they increase and multiply.
Polystyrene can be naturally transparent, but can be colored with colorants. Uses include protective packaging (such as packing peanuts and CD and DVD cases), containers (such as clamshells), lids, bottles, trays, tumblers, and disposable cutlery.
Containerboard, both virgin and recycled, and corrugated packaging solutions (shelf-ready and heavy-duty packaging, trays and boxes) are used for diverse industrial applications including the food sector. Mondi converts kraft paper into bags and specialty products for rugged industrial applications. These bags are compatible with high-speed filling and used primarily in the cement and construction industries. Bags and microwaveable packaging are produced of film-based flexible packaging.