Skip the tubs and keep things clean and simple. Our 4lb extra-large “Fruit in Bag” substrate is a perfectly hydrated coco coir + vermiculite blend, fully sterilized and packed in a heavy-duty bag with a 0.2 micron filter patch—built for reliable, in-bag fruiting with minimal handling.

Made with high quality control from start to finish, this bag is designed to create stable humidity and fresh air exchange so your mushrooms can do what they do best.

Why you’ll love it:
XL bag + filter patch for easy in-bag fruiting
0.2 micron filter patch for strong contamination protection and clean gas exchange
Sterilized + dialed hydration (no guessing, no mixing)
Consistent results with minimal steps and minimal exposure

How to use (simple):
Add 1–2 lbs of fully colonized grain spawn to the bag
Seal the bag and mix thoroughly
Let it finish colonizing, then leave the bag closed while it fruits
No venting or opening needed until your fruits are ready to harvest

The large bag size helps create ideal fruiting conditions, so you can go from spawn to harvest with fewer moving parts—and fewer chances for contamination.

Bulk buying options available for growers who want to stock up