Kraft paper sack, square bottom valve pocket kraft paper bag, valve port extending, Trapezoid kraft paper bag with hot melt sealed bottom, colorful square bottom valve pocket bag, square bottom open mouth bag and liner for moisture proof, square bottom valve pocket kraft paper bag, black square bottom valve pocket bag. Product Features: Square bottom opening, side gusset, valve port( include inside and outside mouth, upper and lower valve port, multiply paper stack, 1-5 color printing, air holes on the body.
