This Universal Inflatable Softbox from Vello fits around the head of most hot shoe flashes, and is held in place with an elastic drawstring and a thick rubber band. The softbox diffuses your flash's light, producing softer shadows while reducing its output by approximately 1.5 stops.
The shape of the softbox allows most flash's auto-focus assist beams to remain functional, allowing you to focus in low light. It is easily inflated and deflated, for quick setup. When deflated, the softbox folds up small enough to slide into a camera bag's pocket.