A pouch, comprising: a packaging bag including a front surface sheet, a back surface sheet, a bottom surface sheet, and the top surface sheet and configured to house contents; and a spout fixed to the top surface sheet and configured to discharge the contents from the packaging bag, wherein the packaging bag includes a pair of side seal portions (110,120) formed by sealing together end portions of the front surface sheet and end portions of the back surface sheet in a width and each having an elongated shape in a height direction, a front bottom seal portion formed by sealing together the front surface sheet and the bottom surface sheet, a back bottom seal portion formed by sealing together the back surface sheet and the bottom surface sheet, a front top seal portion formed by sealing together the front surface sheet and the top surface sheet, and a back top seal portion formed by sealing together the back surface sheet and the top surface sheet, characterized in that at least one of the pair of side seal portions (110,120) includes a side enclosing portion in which a gas is enclosed, the side enclosing portion having an elongated shape in the height direction, and at least one of the front top seal portion or the back top seal portion includes a top enclosing portion (152,162) in which a gas is enclosed, the top enclosing portion (152,162) having an elongated shape in the width direction. a packaging bag including a front surface sheet, a back surface sheet, a bottom surface sheet, and the top surface sheet and configured to house contents; and a spout fixed to the top surface sheet and configured to discharge the contents from the packaging bag, wherein the packaging bag includes a pair of side seal portions (110,120) formed by sealing together end portions of the front surface sheet and end portions of the back surface sheet in a width and each having an elongated shape in a height direction, a front bottom seal portion formed by sealing together the front surface sheet and the bottom surface sheet, a back bottom seal portion formed by sealing together the back surface sheet and the bottom surface sheet, a front top seal portion formed by sealing together the front surface sheet and the top surface sheet, and a back top seal portion formed by sealing together the back surface sheet and the top surface sheet, characterized in that a pair of side seal portions (110,120) formed by sealing together end portions of the front surface sheet and end portions of the back surface sheet in a width and each having an elongated shape in a height direction, a front bottom seal portion formed by sealing together the front surface sheet and the bottom surface sheet, a back bottom seal portion formed by sealing together the back surface sheet and the bottom surface sheet, a front top seal portion formed by sealing together the front surface sheet and the top surface sheet, and a back top seal portion formed by sealing together the back surface sheet and the top surface sheet, characterized in that at least one of the pair of side seal portions (110,120) includes a side enclosing portion in which a gas is enclosed, the side enclosing portion having an elongated shape in the height direction, and at least one of the front top seal portion or the back top seal portion includes a top enclosing portion (152,162) in which a gas is enclosed, the top enclosing portion (152,162) having an elongated shape in the width direction.