Durable Material: Crafted with robust 3.2 mil polypropylene for longevity and resistance against tears. Optimal Size: Generously spacious at 8 x 5 x 20 inches, ensuring ample room for mushrooms to thrive. Transparent Design: Semi-clear exterior allows for easy monitoring and tracking of mushroom growth. Advanced Filtration: Equipped with a 0.2 Micron Filter for uninhibited gas exchange, keeping contaminants out. Sterilization-Ready: Can withstand high temperatures necessary for substrate disinfection.