This is the bag I use for 2lb grains and 2.5lb AIO's, but could do 1-3lb easily with room to spare!

Type: Gusseted

Material: 3.0 Mil Polypropylene

Bag Size: 4″ X 3″ X 18″

Filter Type: T

Filter Size: 1.5″X1.5″

Filter Pore Size: 0.2 microns

Filter Hole: Style L