The present invention is a pouch assembly that can be used to store a carbonated beverage such as beer. The pouch assembly includes a pouch and a fitment. The fitment is mounted within an opening of the pouch. A thread is disposed around an outer surface of the first end of the tube spout. The tread disposed around the outer surface of the first end of the tube spout includes one or more slots. The fitment includes at least one alignment tab. The alignment tab extends away from the canoe portion and includes one or more notches.