Professional Sterility for High-Success Mycology

Unlock the full potential of your lab work with our imported Gusseted Mushroom Spawn Bags. Designed for both high-end commercial farms and dedicated home researchers, these bags are engineered to eliminate contamination risks while simplifying the inoculation process.

Ideal for:

• Primary Grain Spawn: Perfect for 1000g  grain batches.

• Master Cultures: High-purity environments for sensitive genetics.

• G2G Transfers: Ample headspace for easy grain-to-grain expansion.

Technical Excellence & Key Features:

• Bacterial-Grade Filtration: Equipped with a specialized non-woven 0.2μm ePTFE filter patch. This pore size is the industry standard for blocking bacteria and competitor spores while allowing essential CO₂ gas exchange.

• High-Heat Polypropylene (#5): Crafted from food-grade PP capable of withstanding sterilization temperatures up to 126°C (260°F). These bags won’t degrade or cloud significantly after autoclaving.

• 60 Micron Pliability: Thanks to unique production additives, our bags remain flexible and “soft” even after multiple sterilization cycles. This prevents the brittle “crunch” and cracking common in lower-quality imports.

• Gusseted Design: The side-fold (gusset) allows the bag to stand upright independently. This maximizes your autoclave footprint and makes filling a one-person job.

• Hydrophobic Protection: The ePTFE filter repels water (hydrophobic), ensuring that even in high-humidity sterilizers, the filter won’t “wet out” and stall gas exchange. Or worse allow contaminants to grow through.

• Self-Seal Safety: The 50cm length provides enough “neck” to allow for a secure fold or twist-seal during the cooling phase, effectively self-sealing and creating a vacuum-safe barrier before final heat sealing.

• Industrial Bottom Seal: Manufactured with a reinforced 4mm wide bottom heat seal. Specifically engineered for high-pressure environments and load-tested to 10kg to prevent blowouts during handling and sterilization.

How to Use Your Gusseted Spawn Bag

A bag is a bag… until you fold it right! To avoid blow-outs, maintain perfect sterility, optimal moisture, and get the best colonization results, check out our detailed step-by-step tutorial:

👉 Sterilizing Commercial Grain Spawn Bags – Full Tutorial

It covers proper folding technique, filter orientation, loading tips, sterilization cycles, and common pitfalls to avoid.

Why Choose STS Bags over Jars?

• Scalability: One bag replaces approximately 3 standard 750ml jars, significantly reducing labour and handling time.

• Safety: No risk of glass breakage or explosive pressure build-up.

• Recyclable: Made from 100% recyclable Polypropylene.

Elevate your cultivation standards with the reliability of STS-tested bags. Whether you are scaling an oyster farm or preserving rare Lion’s Mane genetics, these bags provide the sterile foundation your mycelium deserves.