... in USA. The one-way valve can let out the CO2 emitted from the coffee, while prevent ... bag style can be three-side sealed, stand up with resealable zipper, side gusset, qual-seal etc., just ... with freight collectStyle / TypeStand-up bag / 3-side-seal bag /Quad-seal pouch / Back center ... sealed bag / Side gusset bag / Bottom gusset pouch /Zipper bag /Spout ...