Parachute Deployment Bag.
When you see file footage of a parachutist clipping in a yellow line to the aircraft before he jumps, you’ll know what this bag is. Part no. 56D6276. 1970’s and 80’s dated. Comes with 12 ft. yellow webbing “STATIC-LINE” and quick-hook. New old stock, but expect at least 1 of the canvas loops to be frayed from storage.