Dunnage airbags consist of closed chambers made from an elastic film filled with air. When at rest, only the static load generated by the weight of the package contents bears upon the cushioning. When dynamic loads occur, these are absorbed by compression of the cushion.
Dunnage bags are very safe to use for both the shipping and receiving end of transportation, and are waterproof. They inflate rapidly with compressed air, and are easy to install; compressed air is often available through an outlet in the truck's compressed air system.