Autoclavable filter patch bags designed specifically for mushroom growing. The filter patch on the bag allows the mycelium to breathe, while keeping contaminants out.
These are great for making grain spawn, or sawdust blocks for fruiting. The can be autoclaved / pressure cooked to 15psi. They can be sealed closed with an impulse sealer (heat sealer) or can be closed at the top by twist and fold over the top and then cable tie.
Small size: $1.50 each (holds approx 1kg of substrate)
Medium size: $1.90 each (holds approx 1.5kg of substrate)
Large size: $2.50 each (holds approx 2.5kg substrate standard '5lb' production block