For your consideration are these top of the line mushroom grow bags. These small bags are 4" X 3" X 18" with gusseted sides! Small grow bags with a high filter allows you use much more substrate then most other bags available on the market. Use these bags for running spawn and get great results. The 5.0 micron filter patch allows for proper gas exchange but exclude water vapor so your spawn does not dehydrate. The filter also keeps contaminates out. We choose this filter size for its efficiency and because it allows the bag to be sealed before you sterilize. The material is polypropylene and is heat resistant up to 260F. Gas transmission is 1 in h2O.
Small bags are acceptable for spawn running. You will need a 8" or larger impulse sealer to properly seal these bags, however, you can get away with using packing tape, paperclips or a similar device.
The uses for these bags include mushroom cultivation, mushroom spawn production, incubation of fungal products and bio-control industries.
Material: 3.0 Mil Polypropylene
Bag Size: 4" X 3" X 18"
Filter Type: B
Filter Size: 1.5" X1.5"
Filter Pore Size: 5 microns
Filter Hole: Style L
This bag is identical to bag Type 4B-Inj except that it has no injection port.
This side gusseted breathable bag gives a sturdy stand-up bag after filling and a strong bottom seal. We manufacture it with equipment we designed and with proprietary additives, These bags 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.
Below is an example of a type B, 5 micron filter.