Forest Organics Mushroom Grow Bag 5 count pack 8"X5"X19" 2.2mil PP Filter A 1.5"X1.5" 0.5 micron filter Type: Gussetted FREE US SHIPPING Bag Size: 8" X 5" X 19" Presealable before Sterilizing Filter Pore Size: 0.5 microns