Dunnage bag inflators are devices that connect an air compressor to a dunnage bag for quick inflation. One side of the inflator connects to an air compressor hose, while the other attaches to the dunnage bag. The inflator swiftly fills the dunnage bag with air to the desired pressure. Inflated dunnage bags fit between and around large items in a shipping container, truck, or rail car, preventing items from shifting during transit.