The Ultimate Foundation for Your Fungal Library

When you are preparing “G1” Mother Spawn, there is no room for compromise. This Mother Spawn Bag is specifically sized for the critical stage between the Petri dish and mass production.  At 35cm in height, these bags offer the perfect headspace for effective “shake and break” colonization while fitting comfortably in most professional and hobbyist autoclaves.

Engineered for Sterility and Strength:

• 0.2µm High-Efficiency Filter: Our specialized filter patch provides the ultimate barrier against contaminants (moulds and bacteria) while allowing for the precise gas exchange required for aggressive mycelial respiration, due to large 4cm diameter breathing aperture.

• Heavy-Duty Polypropylene (PP): These bags are designed to withstand the high temperatures and pressures of sterilization (121°C) without losing structural integrity or becoming brittle.

• Optimal Dimensions: The 10cm x 8cm x 35cm gusseted design allows the bag to stand upright during filling and sterilization, maximizing your “real estate” inside the pressure cooker.

• Smaller Contents: This bag is designed to take 500-750ml spawn optimally, maximum up to 1L, with less volume your autoclave will heat up full bag contents to sterilisation pressures and temperatures quicker. This gives a ‘cleaner’ grain substrate to inoculate your G2 from.

Why choose the 35cm “Mother” Bag over standard 50cm bags?

While our larger bags are the industry standard for growing Commercial G2 grain, the 35cm Mother Bag is the “Goldilocks” size for grain spawn. It prevents the grain from being packed too deep – the bag is designed to take 500-750ml spawn optimally – maximum up to 1L. With less volume your autoclave will heat up full bag contents to sterilisation pressures and temperatures quicker. This gives a ‘cleaner’ grain substrate to inoculate your G2 from.

Technical Specifications:

• Material: 100% Autoclavable Polypropylene

• Size: 10cm (W) x 8cm (Gusset) x 35cm (H)

• Filter Type: 0.2-micron high-flow patch

• Application: G1 & G2 Grain Spawn, Master Cultures, and small-batch substrate trials.