The present invention relates to a cup with a built-in straw and a method of making it. The cup is made from a blank including a flat body portion having a top and bottom edge and two side edges. A first cut-away along the top edge of the body portion defines two portions along the side edges and extending beyond the top edge. A second cut-away is formed adjacent one of the side edges. The body portion is configured to be folded such that the first extending portion is in registration with the second extending portion, and a first side edge of the body portion engages an outer wall of the body portion while the second side edge engages an inner wall of the body portion, to form a cup body with a built-in straw on an inside wall of the cup body with the second cutaway inside the cup body.