Side-fold packaging has four (folded) sides. When the four corners are sealed this is known as  quadroseal packaging. These four seals give the bags more stability and a sleek presentation. Adjustments such as a zip closure, tear-off strip, carrying or suspension holes or a transparent surface can be easily made to quadroseal packaging. Quadroseal bags are an alternative to block bottom bags

VDH Packaging Concept - Quadroseal Verpakking voor Corne de Gatte / Pootaardappelen