Envelope MAILmedia C5 with window and patented closure technology

MAILmedia C5 envelope with window and patented closure technology is designed for sending C5-format documents, invoices and business correspondence while keeping contents protected and ensuring fast, reliable sealing. The transparent window makes the recipient address visible without additional labels, and the patented closure provides a tamper-resistant fastening that simplifies handling in high-volume mailing environments.

Advantages

The window reduces manual addressing and speeds up processing by enabling address visibility from pre-printed inserts. The patented closure technology offers consistent, secure sealing without additional adhesives or tape and reduces the risk of accidental opening during transit. The envelope construction protects documents from bending and environmental exposure while remaining lightweight for postage efficiency.

Suitable for

• Mailing invoices and statements
• Sending formal correspondence and contracts
• Office bulk mailings and automated feeding systems
• Mailing receipts and enclosed inserts with visible address

Key specifications

• Format: C5 (suitable for folded A4 sheets)
• Transparent window for recipient address visibility
• Patented closure technology for tamper-resistant sealing
• Material: envelope-grade paper with protective inner surface
• Lightweight design to reduce postage costs
• Compatible with manual and many automated mailing processes

How to use

Insert the folded C5-format document so the recipient address aligns with the transparent window. Engage the patented closure according to the envelope’s closure mechanism: press or fold as indicated until the fastening secures the flap. Ensure the contents lie flat and the window aligns correctly before sealing. For automated feeding, check compatibility with your system and load envelopes according to the equipment manufacturer’s instructions.

Recommendations

Store envelopes flat in a dry environment to preserve closure function and window clarity. Do not overfill beyond C5 capacity to maintain seal integrity. When using high-volume inserters, run a short test batch to confirm window alignment and closure performance.