Abstract: An improved, easily openable rectangularly-shaped container for liquids such as milk and juice formed of folded sheet paper or plastic, the improvement comprises the addition of an opening device having a first portion connected to the sealed pour spout and a second position integral with the first portion which extends free from the pour spout adapted for hand grasping. The first portion, when the second portion is pulled away from the pour spout, separates the sealed mating upper margins of the pour spout. The improvement may also be detachable after initial opening of the container.