1,name:aluminum foil coffee bag 2,block bottom gusset shape 3,size 1KG coffee bag 4,Non-toxic, BPA free,SGS 1KG ... , which is a very good barrier to resist moisture, oxygen, light etc. With this structure the bag can protect the inside ... the CO2 emitted from the coffee, while prevent the outside light and air, to protect the fresh flavor of the coffee ...