Mushroom Grow / Spawn Bag 0.5 Micron Filter | 3mil Polypropylene | Autoclavable | with Injection Port 8" X 5" X 19" (20cmx12cmx50cm) Our mycology bags are 8" wide, have a 5" gusset, and are 19" long. They are made of strong and durable polypropylene (3mil heavy duty). The bags are sealable with an impulse sealer. The bags are autoclavable and have a 0.5micron respiratory membrane filter. The breathable filter is a 1.5" diameter and is a microporous barrier which allows the passage of air but not contaminates. These bags are suitable for making sterile grain or sterile substrate. Suitable for Autoclave temperatures up to 250°F (121°C)