4A Mushroom Grow Bags

Minimum Purchase:
50 units
Maximum Purchase:
50 units

Genuine Unicorn 4A Mushroom Bags, manufactured from extra thick PP plastic for more durability and high heat resistance. The bags are autoclavable and have a 0.5 micron filter, making them ideal for grain spawn or fruiting blocks. 4A bags can hold up to 2-4lb depending on substrate density. The sealable with 0.5 micron air filter (A) is amazing for mycelium development, preventing moisture to from escaping, while providing the correct amount of gas exchange for the mycelium to colonize any substrate.


Type: Gussetted

Material: 3.0 Mil Polypropylene

Bag Size: 4″ X 3″ X 18″

Filter Type: A

Filter Size: 1.5″ X 1.5″

Filter Pore Size: 0.5 microns – high efficiency

Filter Hole: Style L

This bag is identical to bag Type 4-B and bag Type 4-T except that it has a Type A filter.