Envelope MAILmedia C5 without window, patented closure technology

MAILmedia C5 envelope without window features the brand's patented closure technology designed for secure sealing of C5-format documents and small items. The envelope is made to simplify handling in office and administrative workflows, providing a plain exterior without a transparent window to protect confidentiality and present a clean appearance during shipment and storage.

Advantages

The patented closure technology ensures reliable sealing without the need for additional adhesives or tapes, reducing time spent preparing mail. The windowless design protects sensitive information and allows full-surface printing or labelling. The envelope's dimensions and material selection are optimized for standard C5 documents, offering a balance of durability and flexibility for a variety of contents.

Suitable for

• Mailing C5-format documents such as folded A4 letters, invoices, or contracts
• Dispatching small items, samples, or brochures that fit C5 envelopes
• Administrative and business correspondence requiring confidential presentation
• Bulk mailing and office mailing workflows where uniform appearance is important

Key specifications

• Format: C5 (suitable for folded A4 documents)
• Window: none — solid front for confidentiality
• Closure: patented self-sealing closure technology for secure and fast sealing
• Material properties: durable paper construction with enough stiffness for handling and postal processing
• Surface: printable and suitable for address labelling and stamping

How to use

Insert the C5-size documents or small items flat into the envelope, ensuring contents are aligned and do not overfill. Engage the patented closure according to the manufacturer's guidance—press the closure to secure the flap without additional tape or glue. Check that the seal is continuous along the flap edge and that the envelope is not bulging before sending or storing.

Usage recommendations

Store envelopes flat in a dry environment to preserve closure performance. For secure delivery of confidential documents, use the windowless MAILmedia C5 envelope with the patented closure; avoid overfilling to maintain seal integrity and ensure reliable postal handling.