Our DL (dimension lengthwise), do not bend envelopes provide a secure, reliable and professional way to protect important documents, letters and printed materials during postage. Designed with a rigid back, these hardback envelopes prevent bending, creasing and damage, ensuring your items arrive in pristine condition. Ideal for A4 or smaller contents, each envelope measures approximately 110 mm x 220 mm (4.3 inches x 8.7 inches), making them perfect for A4 sheets folded neatly into thirds, as well as brochures, certificates, invoices and other important paperwork. 

The clear, printed Do Not Bend message gives postal workers an immediate visual reminder to handle your mail with care. A convenient front window allows addresses to show clearly, speeding up preparation and creating a tidy, professional finish. The strong adhesive seal ensures the envelope stays securely closed throughout transit, offering dependable protection and peace of mind. 

Made for everyday office use, eCommerce mailing and professional correspondence, these hardback envelopes help maintain high presentation standards while reducing the risk of damaged mail. Available in bulk quantities with generous discounts from SR Mailing, they offer great value for businesses that send regular documents and want consistent, dependable protection.