this be a simple bag that be about 12 '' by 30 '' inch or so with a wire clip that go around the dust port . it work pretty well in that everything expel from the dust port go into the bag , which be empty by just shake the sawdust out through the same opening .  all together it catch about 80 percent of the sawdust - about what one would expect . the cloth be a thin synthetic and there be no zipper or velcro to make it easier to empty .