These gusseted mushroom grow bags are perfect for when a high efficiency filter is needed. Each bag measures 8" X 4.8" X 19" and are made out of 2.2 mil polypropylene. The filter on these bags is a 0.2 micron filter. The bags are pliable at any temperature, even after sterilization. The bag opening is designed for easy sealing and the bag"s bottom seal can withstand agitation.