Medium Mushroom Grow Bags

Start your mushroom growing journey with these premium medium‑size mushroom grow bags, trusted by commercial cultivators and home growers alike.

Constructed from 0.08 mm polypropylene—around 30% thicker than the common 0.06 mm bags—these bags offer excellent tensile strength and heat resistance. They are fully compatible with autoclaves and pressure cookers, so they withstand full sterilisation cycles without warping or splitting, making them ideal for high‑performance bulk and fruiting substrates.

Each bag includes a 0.2 μm filter patch (38 mm x 38 mm) for clean airflow while keeping out contaminants, supporting vigorous, healthy mycelium growth from inoculation through to full colonisation.

Key features

• Medium size bulk/fruiting bags: great for 1–2 kg bulk or fruiting substrates
• Thicker plastic (0.08 mm): stronger and more heat‑resistant than many standard bags
• 0.2 μm filter patch (38 × 38 mm): optimal gas exchange while blocking contaminants
• High‑temperature resistant: suitable for autoclaving and pressure sterilisation
• Versatile pack sizes: choose from 10, 25, 50 or 100 bags to suit your grow scale

Specifications

• Dimensions: 200 mm (W) × 120 mm (Gusset) × 500 mm (H)
• Comparison: slightly larger than the Unicorn 3T for increased substrate volume
• Material: 0.08 mm polypropylene, autoclavable
• Filter patch: 0.2 μm, 38 mm × 38 mm, positioned for reliable gas exchange

Ideal uses

These medium bags are perfect for:

• Bulk/fruiting substrates for oyster, lion’s mane, shiitake and other gourmet mushrooms
• Masters Mix and other supplemented sawdust recipes
• Ready‑to‑fruit blocks for home setups, market growers and educators

The size works well in standard pressure cookers and benchtop autoclaves, giving you enough volume for productive blocks without overloading your equipment.

How to use

1. Fill with your hydrated grain or substrate mix, leaving headspace to seal and shake.
2. Seal with an impulse sealer or high‑quality cable tie, keeping the filter above the substrate line.
3. Sterilise in a pressure cooker/autoclave following your usual cycle.
4. Cool completely before inoculating with grain spawn or liquid culture.
5. Incubate until fully colonised, then cut slits or open the bag for fruiting, depending on your method and species.

Perfect for hobbyists, educators and commercial growers who want professional‑grade results from reliable, heavy‑duty bags tested in real‑world cultivation.