Mushroom Bags (SacO2, MicroBags)

(5 customer reviews)

Premium polypropylene MicroSac mushroom grow bags by SacO2. A revolutionary depth-filtration system provides perfect, evenly distributed gas exchange via multiple parallel filtered seams without drying out the substrate or spawn. Making them the most advanced breathing bags on the market.

Available for spawn or substrate production. Uniquely different to classic unicorn bags which use surface membrane filtration, the MicroSac offers depth-filtration (much like a HEPA filter).

Whilst a little more expensive, in our side-by-side tests, they have shown to offer noticeably faster colonisation time.

  • Fully Autoclaveable: Guaranteed up to 123°C (253°F).
  • No Dry-Out Zones: Limited contact between filter and bag contents minimises dehydration zone under the filter area.
  • Filter Distribution: Multiple filter strips on each bag ensures even and consistent air exchange throughout entire bag.
  • Application Specific: Different filter widths for spawn bags and substrate bags provide optimum air exchange for different applications.
  • Physical Strength: Made from thick, durable polypropylene, providing excellent strength and tear resistance.
  • Heat Sealing: Can be heat sealed using a standard strip heat-sealer.
  • Development: Designed and developed by national spawn supply company, used industry wide.
  • Completely Transparent: Optimal visibility throughout the entire growing stage.

* Please check bag specifications below or view the SacO2 brochure here before ordering.

Please review the drop-down sections below before placing your order, especially product lead-times if stated.

+ Technical Information
+ Shipping & Returns

FREE SHIPPING AVAILABLE ON ALL ORDERS OVER £50

Orders are typically dispatched on the same or next working day. However, please allow up to 3 working days for dispatch, plus any additional product lead times, especially during busy periods.

We ship our products in plain, unbranded, reinforced cardboard boxes with ample internal protection.

Our shipping couriers may leave parcels with a neighbor or in a safe place if no one is home to receive them. To prevent this, please select the designated signed-for service at checkout and ensure you are available to receive the parcel. Otherwise, the package will be held at your local sorting office or returned to us. Please note that we cannot be held responsible for lost, stolen, or missing parcels if the signed-for service is not chosen at checkout.

Larger orders that require multiple boxes will automatically be upgraded to DPD Local shipping, as they support multi-parcel shipments. Extremely large or heavy orders may need to be dispatched via a pallet.

If items are returned to us due to a failed delivery, a redispatch or restocking fee may apply. Please ensure that any held packages are collected from your local sorting office within 2 weeks to avoid them being returned.

We highly recommend upgrading to the ‘DPD Express Tracked’ service at checkout, as we find it to be the fastest, safest, and most reliable option. Please note that Royal Mail may occasionally experience delays in their sorting offices.

For more details, please refer to our shipping, returns and replacements policy.

This product is currently out of stock and unavailable.

Shipping & Returns info | Free Shipping Available Over £90 🚀
⇓ More product information below ⇓

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5-Star Customer Testimonials

Over 2,300 rave reviews and counting! Here's a random selection (different on every page)...

Thanks for answering my query ahead or ordering and providing high quality, fully sterile grain bags and substrate. Good value, allowing me to grow which saved me money on what would have been more expensive to buy.

⭐⭐⭐⭐⭐Mark Brownsmith on Google

k, speedy delivery, I wouldn't go anywhere else for my mycology needs. Thank you so much.

⭐⭐⭐⭐⭐Steve on Trustpilot

Delivery, quicker than expected. High quality product as well. Very pleased with the purchase. Many thanks. 😀

⭐⭐⭐⭐⭐Dan Eggleton on Google

Very happy with the products from this store. Purchased on etsy and had a good experience and will definitely come back again

⭐⭐⭐⭐⭐Isaac Antoine on Google

Mushroom Bags (SacO2, MicroBags) FAQ

Answers to frequently asked questions.

How will my product be packaged and shipped?

We invest significant time and resources to ensure our parcels are securely packaged and reach you safely and undamaged.

If your item requires a box, it will be shipped in a discreet, plain, sturdy, double-walled cardboard box of appropriate size, with unbranded packaging tape and ample internal protection to prevent damage during transit. While accidents are rare, they can occasionally happen.

Smaller, sturdy, and lightweight items will be sent in plain, unbranded padded envelopes.

All pallet orders are professionally strapped, wrapped, and equipped with corner protectors.

We also strive to minimize excessive packaging to help protect the environment.

Scroll down to see a section on our Shipping & Returns info, with links out to our policies

Can you do custom and bespoke orders?

Yes, we can accommodate your needs for any custom orders, substrate / grain mixes, special requests etc. Generally speaking, anything which is considered to be a custom order will have a bespoke price. Please contact us to discuss options.

Do you accept cash payments?

As an online-focused business, we prefer digital payments. However, for orders over £500, we do accept cash payments. Please contact us to process your order and arrange collection.

Can I collect my order from your facility?

We do not provide a standard collection service for orders under £500. If your order exceeds £500 and you wish to collect it, please contact us. Please note that, due to our insurance policies, we are unable to allow public access to our warehouse or offer tours of our facilities.

Spawn Bag Specifications

Medium Spawn Bag
Medium Spawn Bag

Size: Medium
Product Code: PP75/BEH4+1/V22-49
Film thickness: 75 μm
Number of filter strips front: 1
Number of filter strips back: 4
Bottom gusset: yes
Height: 49 cm (20.9 inch)
Width: 22 cm (8.7 inch)

Large Spawn Bag Mushroom Cultivation
Large Spawn Bag

Size: Large
Product Code: PP75/BEH6/V37-53
Film thickness: 75 μm
Number of filter strips: 6
Bottom gusset: yes
Height: 53 cm (20.9 inch)
Width: 37 cm (14.6 inch)


Substrate Bag Specification

Medium Substrate Filtered Mushroom Bag
Medium Substrate Bag

Size: Medium
Product Code: PP75/SEH6/V32-49
Film thickness: 75 μm
Number of filter strips: 6
Bottom gusset: yes
Height: 49 cm (19.3 inch)
Width: 32 cm (12.6 inch)

Large Mushroom Substrate Filtered Bag
Large Substrate Bag

Size: Large
Product Code: PP50/SEU4/V40-51
Film thickness: 50 μm
Number of filter strips: 4
Bottom gusset: yes
Height: 51 cm (15.7 inch)
Width: 40 cm (15.7 inch)


SacO2 Videos

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SHIPPING & RETURNS INFO

No fuss Shipping, Returns & Guarantee.

  • We aim to dispatch orders within 2 working days (Monday-Friday)
  • Free shipping option for orders over £50.00 - Shipping Policy
  • No questions asked returns & refunds policy - Returns & Refunds Policy

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PRODUCT REVIEWS

5 reviews for Mushroom Bags (SacO2, MicroBags)

  1. Steve Price

    great quality bags which work, worth the little extra in price in my opinion with decent savings when buying bulk amounts. Thank you

  2. Jackie

    I think the previous two reviews covered it all. Great bags which have improvements over traditional unicorn bags. Will continue to use these in the future.

  3. Julie Omar

    better value than unicorn bags at 20% off… ordered 100 for the time being but if you keep the 20% offer going I'll buy more in the future. Arrived well packaged 2 days later

  4. Martin Riley

    Quality grow bags at a good price. I share the same experience as 'Martin the mushroom man', increased colonization times more uniform across the bag and less contamination issues (on 50 bag grow)

    A little something to add: I've had times where I've punctured holes in filter in unicorn bags when handling. These bags seem to mitigate this issue due to their different filtration design.

    For me they are worth the small price increase. – An innovative approach to the standard mushroom grow bags

    Thanks

  5. Martin the mushroom man

    Got sent a couple of these bags in a recent order as a bonus gift to try out (thank you very much!), I wasn't sure what to expect as I've never heard of them before. But, I can confirm the following from a direct A/B grow comparison using golden oyster strain on hydrated rye grain:

    * Colonisation speeds in these bags increase by ~20%
    * Colonisation is noticeably more consistent presumably from the increased areas of filtration/air exchange.
    * Quality and strength of bags are similar, they also heat-seal well using an impulse heat sealer.
    * I've had contamination problems before if filter has got wet during colonisation of Unicorn bags, it seems to draw in contamination. The design of these bags mean there is increased depth of filter medium so I'm hoping these will be better in the future, but cannot draw accurate conclusions from a small growth trial.
    * These are a little more expensive than unicorn bags.

    In conclusion: thanks for allowing me to trial them, if the price came down a little to be more in line with Unicorn bags, I'd likely order them instead.

    Thanks and hope this is helpful for some.

    • Paul T. (Founder)

      Hi Martin!

      Many thanks for leaving such a great review, it's great to have feedback from our customers and no doubt you would have helped many other people out there.

      We use these bags exclusively at Maya Mushrooms for our mushroom blocks and spawn bags (there are two different type for people wondering). Since moving over, we've noted a significant reduction in contaminated bags as well as a quicker colonisation time around 20% as you noted. For us, the slight increase in price is worth it.

      We will wait to see what the demand is for the bags, if it's high enough to reach another price-point from our supplier, we might be able to offer them at a better price. Watch this space!

      Regards,
      Paul

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