A package includes a first adjacent edge, a second adjacent edge, and a fitment seal including a fitment. The fitment seal is inclined at a fitment seal angle relative to the first adjacent seal, and connects to the first adjacent seal and the second adjacent seal. The package further includes at least one supplemental seal extending towards the first adjacent seal. The at least one supplemental seal is inclined at an angle from 90° to 180° relative to the first adjacent seal.