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These Type T filter bags from Unicorn Bags are perfect for use in the production of grain spawn and holds about a kilogram of spawn. This 4" x 3" x 18" side-gusseted breathable bag gives a sturdy stand-up bag after filling and a strong bottom seal. Unicorn Bags manufacture it with equipment they designed and with proprietary additives, they are pliable at any temperature as well as after sterilization. The bag opening is designed for easy sealing and the bag's bottom seal can withstand agitation.