... metallic structure, can be with a clear window3)Printing: can printed with your logo or design, or plain bag. Up to 12 colors.4 ... : one-way degassing valve (PBI, WIPF brand...)6)style:stand up with resealable zipper, quad-sealed, back center sealed, back corner sealed ... .7. The bag style can be three-side sealed, stand up with zipper, side gusset, quad-sealed etc., just according to your ...