When I made my bag, I just went with the old stuff it in hand technique. I didn't own a shop-vac at the time, so that was really my only option. Far less messy than I imagined, maybe only 1-2grams of down escaped in total. Just move veeeery slowly with your hands, and make sure there is no air current in the room. Once you get the down in the baffle, tape or hand stitch it close.