The ultimate versatile packaging solution, M spec mailers can act as a capacity mailer or as a box. In their mailer form, they can carry items flat, offering a sleek form factor that can fit through a letterbox. When in box form, they provide much more space to pack items. These mailers are perfect for businesses that sell several different sizes of products and don't want to purchase multiple different packaging solutions. Their design allows the user to switch very quickly between the box and mailer form, making them 60% faster to pack than standard book wrap mailers. They're also more cost effective than boxes due to their compact design. See our capacity mailer range and save money today!