Mushroom Grow Bag with Air Filter 50x12x20cm – Professional Mycology

The Mushroom Grow Bag with Air Filter (50x12x20cm) is the professional standard you need to stop playing Russian roulette with your fungi cultivation. It is a heavy-duty, autoclavable container designed specifically to house your substrate and mycelium in a sterile, breathable environment, ensuring that your only concern is how to harvest so many mushrooms.

Stop the contamination chaos and organize your grow

Problem: We've all been there. You try to grow using random glass jars, repurposed Tupperware, or cheap sandwich bags. The result? A chaotic grow space, broken glass, lids that don't breathe right, and the constant, looming threat of contamination. Your incubation area looks like a mad scientist's failed experiment, and you can never be sure if that white fluff is healthy mycelium or the start of a disaster.

Agitation: There is nothing more frustrating than waiting weeks for colonization, only to wake up one morning and find the dreaded green mold (Trichoderma) taking over your hard work. It's not just a waste of money on spores and substrate; it's a waste of your precious time and enthusiasm. That stress of "will it work this time?" kills the vibe of the whole hobby.

Solution: This Mushroom Grow Bag brings order and security to your setup. By using a dedicated, professional-grade vessel, you eliminate the variables that cause failure. It simplifies your process, allowing you to stack, store, and sterilize with absolute confidence, keeping your workspace clean and your mind at ease.

How your cultivation space changes once you add it

Forget about a shelf full of mismatched jars clinking together. Once you switch to these grow bags, your incubation area transforms into a streamlined, professional operation. The bags are flexible yet sturdy, allowing you to maximize space by fitting more substrate into tight areas compared to rigid containers.

Visually, you gain clarity. The high-transparency polypropylene lets you monitor colonization progress at a glance without opening the bag and risking contamination. It turns a messy, amateur attempt into a clean, efficient Smartshop style laboratory where every element has its place and purpose.

What you can organize and grow with this product

This bag is the blank canvas for your mycological art. It is designed to hold and protect various biological materials:

• Grain Spawn: Rye, millet, wheat, or corn for the initial colonization phase.
• Bulk Substrate: Mixtures of coco coir, vermiculite, and gypsum.
• Sawdust blocks: Perfect for wood-loving gourmet species.
• Manure-based mixes: For those potent strains that need extra nutrition.
• Sclerotia producers: Ideal for keeping Magic truffles developing in a dark, safe environment.

Steps to build your organised set-up

1. Prepare your mix: Hydrate your chosen Mushroom Substrate to field capacity.
2. Fill the bag: Load the bag with the substrate, taking care not to get debris on the upper sealing area.
3. Fold and Sterilize: Fold the bag properly (accordion style) and place it in your pressure cooker. The material withstands the heat perfectly.
4. Inoculate: Once cool, open the bag in a sterile box (SAB) or in front of a flow hood to introduce your spores or liquid culture, then seal it immediately with an impulse sealer.
5. Incubate: Place the bag on your shelf. The filter patch will handle the breathing while you relax.
6. Check: Occasionally inspect for white, healthy growth through the clear plastic.

Advantages and benefits of having everything in its place

• Zero Contamination: The 0.2-micron filter allows air in but keeps bacteria and mold spores out.
• Massive Yields: Holds more substrate than a standard jar, leading to larger flushes.
• Durability: Thick polypropylene won't tear easily during handling or mixing (break and shake).
• Space Efficiency: Bags can be molded to fit your incubator perfectly, unlike round jars.
• Safety: No risk of shattering glass if you accidentally drop it.

Frequently Asked Questions

How much substrate does this bag hold?

With dimensions of 50x12x20cm, this bag can comfortably hold between 2 to 3 kg of hydrated substrate, leaving enough headspace for gas exchange and manipulation.

Do I need an impulse sealer?

For the best results, yes. An impulse sealer creates a hermetic seal. However, many growers successfully use zip-ties or heavy-duty tape if they fold the top correctly, though sealing is the pro move.

Can I reuse the bag?

Technically, the plastic survives, but we strongly advise against it. The plastic can develop micro-tears, and cleaning the filter patch perfectly is nearly impossible. For the price, it's better to use a fresh, sterile bag every time to ensure success.

Is it suitable for pressure cookers?

Absolutely. These bags are designed to withstand autoclave temperatures (121°C / 15 PSI) without melting or becoming brittle.

Personal Experience of Pevgrow’s CEO (Alan)

I started out just like many of you, hoarding glass jars and boiling them in a pot. It worked, but it was messy and heavy. When I switched to these grow bags with the air filter, the difference was night and day. Suddenly, I could prepare 5kg of substrate in one go instead of managing 10 tiny jars. The "break and shake" method is so much easier with a flexible bag—you just mash it around to speed up colonization, something you can't do with glass.

My personal trick? I always leave a bit more air inside the bag before sealing it than I think I need. That extra air pocket acts as a buffer and helps the filter patch work more efficiently during the rapid growth phase. It’s a small detail, but it keeps the mycelium running fast and aggressive. If you want to scale up your hobby, this bag is the first piece of gear you need to upgrade.