These are 14a filterpatch mushroom grow bags. They hold approxietly 5-6 pounds of hydrated substrate. 
Free shipping in US. Contact me for additional shipping quotes.
 
Manufacturer's specs:
Type: Gussetted
Material: 2.2 Mil Polypropylene
Bag Size: 8″ X 5″ X 19″
Filter Type:A
Filter Size: 1.5″ X 1.5″
Filter Pore Size: 0.5 microns
Filter Hole: Style L