Sturdy bags made to fit your tub. You’ll want these for sure as you get more juice by using them. They last a long time but it is always nice to have a spare. Just insert the bag into the tub and hang the excess over the sides. Grind your apples in the bag then fold over to complete the bag and put your pressing plug on top. When you apply pressure with the screw the juice will filter out through the bag giving you juice clear enough to drink with the pomace of seeds, skins, and stems contained in the bag. Just empty the bag and use it over again. Wash with clear water when you’re through and store for next year. Will last many years.