Amps Cardboard Document Mailer A4 CM11 (10 pack). It’s dimensions are 316mm(W) X 243mm (L) +61mm(T). It is a rigid cardboard document mailer without window. It comes with an easy peel and seal to close with tear zip strip for easy opening. It offers high level protection for your documents. Ideal for sending photos or documents through the post. These cardboard mailers are lightweight and economical. These are essential to fulfil your mailing needs. These cardboard envelopes are more reliable than the typical paper envelopes. Neo Online’s products are specifically designed to provide the ultimate protection to your items.