Riisoyu 20 PCS Mushroom Spawn Grow Bags, 18 x 35cm Substrate Bags Made from polypropylene, with a 0.2-micron filter membrane, tear-resistant and fully transparent

Polypropylene material: Mushroom Grow Bags is made from high-quality polypropylene, which is sturdy and durable with excellent tear resistance. It is unlikely to tear during filling, handling and day-to-day management, reducing the risk of air leakage later on Perfect dimensions: Measuring 18 × 35 cm, Mushroom Filter Bags is a moderate size that neither takes up too much worktop space nor restricts the mycelium’s ability to spread. 0.2-micron filter membrane: Mushroom Grow Bags is fitted with a 0.2-micron microporous filter membrane, which allows for free gas exchange between the inside and outside of the bag to meet the mycelium’s respiratory needs, whilst effectively blocking the entry of external contaminants. Fully Transparent Design: Mushroom Spawn Grow Bag is made from a high-transparency film with excellent light transmission. This allows you to clearly observe the substrate’s moisture level, the growth status of the mycelium and the presence of any foreign fungal spots without having to open the bag. Versatile: Mushroom Substrate Bags is suitable for propagating common edible and medicinal mushroom strains, and can also be used for cultivating grain cultures, making sawdust blocks and a variety of other horticultural applications.