Dunnage Bags can be used in containers, trailers, trains and ships.
The concept of Dunnage Bags is to be a cushion, protect loads against impact,  brace the load and prevent movement.
the re-usable valve allows for the re-use of the bags. Inflating time is minimum, which makes it possible to save on labour costs. This makes Dunnage Bags a very economical system for securing loads.
Dunnage Bags are available in various sizes.

Link: The Section of Dunnage Bags