Meet MAILmedia C4 self-adhesive mailers—window-free, white offset stock envelopes designed for secure, professional document shipments. Ideal for offices, freelancers, and small businesses that regularly send A4 documents flat without folding.

Key Features & Design

• Size: C4 (approx. 229 x 324 mm) to hold standard A4 documents flat.
• Self-adhesive: quick, reliable seal—no moisture or tape required.
• Windowless: privacy for confidential contents.
• Material & weight: durable 90 g/m² offset stock; lightweight envelope at ~15.2 g each.
• Color: crisp white for a clean, professional look.
• Stock code: Offset (38141-0) for easy ordering.

Performance & Benefits

Sending documents is easier and more cost-efficient with these C4 mailers. The size fits standard A4 paperwork without folding, while the window-free design protects privacy during transit. The lightweight 15.2 g envelope helps manage postage costs, and the strong self-adhesive seal ensures secure closure through handling and mailing.