Small Injection Port Filter Patch Bags (4T)


FULL BOX ORDERS ARE A SPECIAL ORDER ITEM!! Please contact us for further details before ordering a full box. 

4T Unicorn Brand autoclavable injection port bags are popular for making small quantities of mushroom grain spawn.  Fill with substrate and sterilize.  Once cool, inoculate by injecting liquid culture with the syringe through the injection port.  The filter allows for air exchange, while keeping contaminants out.   Small size injection port bags (4″ x 3″ x 18″) with 0.2 micron filter.

Full boxes by special order only. Contact us about discounts and production timeline.

**Lowest Price to your door.  As low as $1368.95/box with bulk discount and payment via etransfer**

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2.5% with 2-4 boxes

5% with 5+ boxes

Small Injection Port Filter Patch Bags (4T) $3.98$1,471.99

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Small Injection Port Filter Patch Bags (4T)

Unicorn 4T bags injection port bags are made for mushroom growing, and are a popular choice for those wanting to make medium quantities of grain spawn.

Fill with your desired substrate such as cooked rye, fold the top of the bag down, and sterilize in an autoclave or pressure canner at 15psi.  Made of polypropylene, these mushroom growing bags can withstand this extreme heat.  However, be sure to follow the equipment manufacturer directions.  A couple of our customers have melted their bags by not using the necessary amount of water in a pressure cooker.

After sterilizing substrate, let cool, inoculate by injecting liquid culture with the syringe through the injection port.  Bags can be sealed with an impulse heat sealer, bag clamps, or zap strap.  The finer “T” filter provides for air exchange while keeping out mold spores and contaminants larger than 0.2 micron.

4T injection port bags – (0.2 micron) (4″ x 3″ x 18″) 2.2 Mil Polypropylene
Small: Holds ~2.5lbs substrate

LOWEST BOX PRICES delivered to your door.  We ship in 1-2 business days from within Canada.  No hassle clearing customs, nor unexpected cost of brokerage and duty.  If you find a lower price including shipping and brokerage, give us a chance to beat it!

FOR FULL BOXES SAVE AN EXTRA 2% when paying by etransfer!
Select to pay by etransfer at checkout, and fill in customer note with request for etransfer discount.  We will apply the discount and email you a revised invoice.

Additional information


1, 10, 100, 1000