Masters Mix

Finally an affordable sterilization kit.

MushroomMediaOnline.com is proud to offer these Presto Mushroom Sterilization Kits.

In order to give back to the Mushroom Community, we offer a 23 quart Presto, 25 Unicorn grow bags and a 10lb bag of our amazing Fast Fruiting Mix all for the low bundle price.  Once you add the Presto to your cart a pop up will offer you the masters mix and available Unicorn Bags to choose from.  The discount is automatically applied as the line item titled “Presto Kit – Bundle and Save!” in your cart.

So you not only get a great deal you also get your hands on the best mushroom grow bags and substrate on the market. We have these ready to ship now.

Unicorn Bag Type XLS-A - 1000 Count

$549.95
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10″X 5″X 24″ - 3.0 Mil - 2”X 3” .5 micron A Filter - Typical Block Size: 10-15 lbs
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Unicorn Bag Type XLS-A - 1000 Count
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To maintain stock our customers, we may limit the number of cases available per order. If you need more than we have listed, please contact us.

These 3.0 mil thick bags also have a 2”X 3” filter that is .5 micron size. The XLS-A is ideal for larger growth blocks from 10-15 lbs in size. These bags are the best going for your fruiting stage. The largest bags we offer these Unicorn bags are the industry leader for a reason. All of our Unicorn bags are Polypropylene which means they are autoclavable.


As you expand your mushroom growing business, a major factor in your success is efficiency. Larger blocks help you be more productive, growing larger flushes each time. You can even save more time with MushroomMediaOnline’s own Fast Fruiting Mix that is that ideal mix of 50/50 hardwood sawdust substrate supplemented with 50 percent soy hulls.

Free shipping with your bag purchase from MushroomMediaOnline.com

We offer the lowest cost per bag by finding the very best shipping rates for your bag delivery. The larger your order size, the more you can save. Choose your purchase size and see the full price with free shipping included.

Brand: Unicorn

Model Number: XLS-A

Material: 3.0 Mil Polypropylene

Bag Size: 10″X 5″X 24″

Filter Size: 2”X 3” .5 micron

Typical Block Size: 10-15 lbs