Package Included : You will receive 50 pieces of mushroom growing bags, size of 25 x 50 cm. The square gusset bag can help increase the number of mushrooms and can provide enough space for the growth and oviposition of the mushrooms and substrate. Premium Material : Made of high quality polypropylene, durable, not easy to damage , has good tear resistance, temperature resistance, it is the best choice for growing mushrooms. Can bring you long-term use and reusable. Air valve window design : Ventilation window design saves a lot of labor. No need to drill and oxygenate. Our mushroom spawn bags are designed with filter vents to absorb fresh air and prevent unwanted items from entering. With the transparent bag, all contamination situations can be quickly identified. Indispensable for mushroom planting : using these bags for spawning can shorten the mycelial fermentation cycle. Compared to trays and pots, this kind of mushroom grow bag saves time and effort. Widely Used : Mushroom grow bags are widely used in indoor gardens, planting tents or greenhouses, farms, etc., very suitable for growing mushrooms , mushrooms, cereals and other plants.