Give your projects magic results using Gymgit Mushroom spawn Bags. Sealable Gusseted Polypropylene Filter Patch A Simple Way to Grow Mushrooms at Home These mushroom grain bags are made for durable 3 mil polypropylene and measure 8x5x20 inches. Each spawn bag has a .2 micron filter and can easily hold 5-7 pounds of spawn or substrate. This side-gusseted breathable bag gives a sturdy stand-up bag after filling and a strong bottom seal. They can be sealed with an impulse sealer or just tied shut at the ends. Material Thickness: 3 Mil Polypropylene Color: Transparent Size: 8" X 5" X 20" Air vent window size: 55×55mm Air vent window aperture: 0.2um Sealable Gymgit Mushroom bags can be sealed with an impulse sealer or quickly twist the top of the bag and tightly wrap the the wire around the twist. High Flow Spawn Bags The spawn bags with 0.2 filter patches allow for the mushroom cultures inside the bag to receive fresh air without passing contaminants pollutants. Multi-function Multi-use for inoculation of clone oyster mushrooms, bamboo fungus Ganoderma mushroom, sawdust fruiting blocks, and more. Great for Professional mushroom growers, farmers, mushroom cultivation. 30-Pack Mushroom Grow Bags 15-Pack Mushroom Growing Bags Add to Cart Add to Cart Customer Reviews 4.5 out of 5 stars 348 4.5 out of 5 stars 348 Price $17.98$17.98 $9.80$9.80 High Quality Material 3 Mil Polypropylene 3 Mil Polypropylene Size 8" X 5" X 20" 8" X 5" X 20" Color Clear Clear Sealable ✓ ✓ 0.2 Micron Filter Patch ✓ ✓