Amazon.com : Milliken Mushroom Supply - Mushroom Spawn Bags with self-Healing Injection Port, 0.2 Micron Gas Filter, 3 Mil. Pack of 10 - Trusted by The Pros - Medium 4″Deep X 5″
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Amazon.com: Unicorn Bags BioD 10-T Injection Port Mushroom Grow Bag Small Polypropylene 5 inches x 4 inches x 18 inches 0.2 Micron Filter (20) : Industrial & Scientific