Microppose Premium Spawn/Grain Bags are designed to boost colonization speed and yield healthier, larger mushroom fruits—all while saving you money. Each bag comes equipped with a strategically placed 0.22-micron filter patch, delivering excellent fresh air exchange (FAE) for faster, more robust growth. Made from durable 3 mil polypropylene, these gusseted bags help lower the risk of contamination by resisting micro-tears better than cheaper alternatives. Enjoy bigger harvests, fewer contaminants, and easier cultivation with a bag that beats more expensive brands on both quality and price.

• Large 0.22 Micron Filter Patch: The generously sized hydroscopic filter patch efficiently promotes FAE, speeding up colonization and improving overall mushroom health.
• Ample 20" x 8" x 5" Gusseted Design: The roomy interior allows the substrate to expand comfortably, leading to better nutrient distribution and healthier fruiting.
• 3 Mil Polypropylene Construction: Tough and tear-resistant, this heavy-duty material significantly reduces micro-tears and lowers contamination risks.
• Enhanced Fresh Air Exchange: By optimizing airflow, you can expect faster colonization times and the potential for larger, more vigorous mushrooms.
• Exceptional Value: These spawn bags offer premium performance at a lower cost than competing brands, helping you save time and money.