Easy to open: Due to pre-lining in manufacturing, it's easy to open by tearing along the openings. Easy to take out: Increasing the press bar and knife line in case of constant cardboard area. Put finger into depression to take out the product, for pressing the tangent of four corners. Easy to display: Pre-design the shape, crease line on top of the carton and together with the layout, it can be turning into a creative billboard after folding.