Metal cases come in a variety of sizes and will serve many different purposes. Mainly, they are used in the transport and storage of cargo. This can include firearms and ammunition; however, these are not the only things metal cases can be used for. Many people find these types of containers useful for storing things in their attics, basements or garages.
These cases are built to be highly durable and can withstand a fair amount of punishment. They will not get dinged or dented easily. This makes them good for protecting certain items while they are in storage or while you transport them.
Heavy duty shipping cases offer great protection when shipping cargo by land, sea or air. They are made with strong materials and the insides of these cases can be lined with foam to offer the best protection against breakage. They are also available with wheels so that they can be rolled for easy maneuverability. If you need to ship goods over long distances, or if you are traveling with items you need to protect from damage, metal shipping cases will be your best bet for full protection.
Hard protective shipping cases offer superior protection against water damage. These water-proof field boxes not only resist moisture, but dust as well. They also protect against damage from impacting with other containers as well as with walls and floors as they are moved around. Should one of these boxes take a tumble, the contents inside will remain protected, as long as they have been lined with foam and adequate care has been taken in the packing of its contents.
Military shipping cases can be used for their intended purpose of transporting guns, ammo, and other military materials, but they can also be fitted out to ship or store whatever items you need to keep protected from the elements and from rough handling. Military gun cases also provide options for shipping rifles and other firearms.
For whatever purpose you need a strong, impact-resistant container, there are a variety of metal cases that can be purchased that will fit your particular need. References.