Unicorn Bags 4B Injection Port Full Case (1,000) OxoD Mushroom Grow Bag Extra Small Polypropylene 4” x 3” x 18” 5 Micron Filter Biodegradable


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  • Self-healing injection port enables sterile introduction of cultures and spore solutions.
  • 5 Micron filter with 90% surface area available enables fast gas and allows sterilization of pre-sealed bags.
  • Biodegradable – Oxo-Biodegradable additive, bag breaks down in a wide range of conditions and does not leave microplastics.
  • Autoclavable – Withstands high temperature and pressure for steam sterilization up to 120c.
  • Gusseted for strength and easy filling.

The Unicorn Bags 4B OxoD is a top-quality polypropylene bag designed for growing gourmet mushrooms such as oyster, lion’s mane, and enoki. Made with a 5 micron, high surface area type B filter, this bag is engineered to enable high gas exchange and humidity control while keeping out contaminants. The larger pore size allows for sealing this bag before autoclaving without damaging the filter or seals. This bag is ideal for producing fruiting blocks very quickly and consistently.

The self-healing injection port allows sterile introduction of liquid culture or spore solutions without opening or resealing the bag. The port closes automatically after each use, preventing contamination and maintaining a sterile environment for your mycelium to grow.

The standout feature of this bag is the OxoD technology, which ensures the bag degrades into its base components with long-term exposure to oxygen, heat, and light, making it an eco-friendly option. Upgrade to the Unicorn Bags OxoD line, and you’ll be doing your part to keep plastics out of our oceans and landfills.

Whether you’re a professional mushroom grower or a hobbyist, the Unicorn Bags 4B OxoD bag with self-healing injection port is the perfect choice for achieving reliable spawn production. With its durable, heavy-duty construction, advanced filter technology and eco-friendly features, it’s a reliable and sustainable option that you can count on.

Type: Gusseted
Material: 3.0 Mil Polypropylene with an oxo-degradable additive
Bag Size: 4″ X 3″ X 18″
Filter Type: B
Filter Size: 1.5″X1.5″
Filter Pore Size: 5 microns
Filter Hole: Style L

Additional information

Weight 31 lbs
Dimensions 23 × 9 × 11 in


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