Spawn Bag, PPD (0.075mm), Zipper Filter Bottom, Bottom Gusset, 37x53cm

Spawn Bag, PPD (0.075mm), Zipper Filter Bottom, Bottom Gusset, 37x53cm

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Introducing Sac O2 Premium Zipper Filter Growing Bags, co-developed by European market leaders Sac O2 and Mycelia. These bags are rigorously designed to offer unparalleled resistance to contamination—boasting the highest contamination resistance rating in the market.

Operating on principles similar to HEPA filtration technology, these filters are composed of hydrophobic fibres arranged in a randomised pattern. This design ensures the effective trapping of microorganisms. In addition, the air is directed through an extended filtration path, elevating its efficacy as a high-performance filter.

Learn More About Zipper Filters

This specific model comes with a bottom gusset, allowing this bag to free stand for easy use.

Constructed from high-grade polypropylene, our mushroom growing bags are impressively resilient and tough. Whether you're a hobbyist or a commercial producer, these bags are the ultimate choice for reliability and performance.

    • Autoclavable: the bags are guaranteed to endure temperatures up to 123° C or 253° F, making them autoclave proof.
    • No dry-out zones: contact between filter and substrate is limited, minimizing substrate dehydration under the filter zone.
    • Flexibility: the length of the bags and the distribution of the filters are adapted to the application and desired gas exchange rate.
    • Physical strength: Microsacs are subjected to rigorous tests to ensure that the bags remain strong after heat treatment and physical handling.
    • Development: Microsacs are constantly tested and improved in cooperation with our sister company Mycelia, ensuring that our products meet large production demand and automation standards.
    • Dimensions: 37 × 53 cm
    • Size: Large
    • Filling Volume: >5 Litre
    • Film Type: Polypropylene (PP)
    • Film Thickness: 75 µm
    • Filter Amount: 6
    • Filter Location: Both Sides
    • No. Front Filters: 3
    • No. Back Filters: 3
    • Filtration Method: Depth Filtration
    • Gas Exchange: Medium
    • Gusset: Bottom


    Note: Please refer to the specific lead times shown on product pages for more accurate delivery times.

    1. Small Orders (E.g. 100ml Spawn, Plugs): Sent via Royal Mail large letters.
    2. Medium-Sized Orders (under 2kg): Royal Mail 24-48 hour tracked parcel.
    3. Large Orders (2kg+): via DPD Express.


    1. Standard Returns: Returns and exchanges within 14 days of receipt. The item must be unused and in its original packaging. See our returns policy here.

    This does not apply to our Gift E-Cards, which are delivered via email.

    Unicorn Bag Comparison

    Unicorn 3T
    Bag Material
    Polypropylene Dura (PPD)
    Material Thickness
    37 cm x 53 cm
    20 cm x 12 cm x 48 cm
    Filling Volume
    5 L
    3 L
    Filter Material
    0.2 microns
    Filter Amount & Location
    6. Both Sides. Bottom
    1. 1 Side. Top
    Moisture Retention
    Not specified
    Gas Exchange
    Not specified
    Sterilisation Process
    Autoclavable/Heat Resistance: 123°C–253°F
    Autoclavable/Heat Resistance: 123°C–253°F

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