Unicorn has been the world leader in pre-filtered mushroom grow bags since 1990. We extrude our own bags and make our own filter, then combine the two to give farmers across the world the easiest, most reliable way to produce mushrooms. From our 0.2 micron spawn bags to 5.0 micron fruiting bags and everything in between, our complete in-house production means we can fully customize to fit the needs of any project while maintaining the tightest levels of quality control found anywhere in the industry.