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″
Uninoculated Spawn Bags - Mushroom Farming
How to Make a Spawn Bag | Grain Spawn Experiment - YouTube