Are best used to control movement of cargo loads in railcars, trucks, or overseas containers. They manage the movement of cargo by bracing loads, filling voids, protecting cargo from in-transit damage, and absorbing vibrations.bag are inflated with air and placed between items in a shipping container or truck. They prevent large items from shifting during transit, protecting against damage to the shipment. They secure items for shipment to keep the truck, trailer, or container evenly balanced.