Technical Superiority & Protection
The MPB6 series redefines the standard envelope by applying corrugated box technology to a flat mailing format. The E-flute structure (1.2-1.7mm thickness) acts as a protective shield, ensuring that books, documents, or electronic accessories remain pristine throughout the logistics chain.

Functional Innovation
Speed & Convenience: The built-in thermal adhesive seal eliminates the need for plastic tape, reducing packing time by over 50%.

Adaptive Volume: By folding the side borders, the envelope transforms to accommodate items up to 4cm thick (adjusting the effective dimensions to 42x26x4 cm).

User Experience: The intuitive tear-strip provides a premium "unboxing" feel for the recipient, allowing for tool-free access.

Sustainability & Efficiency
Crafted from 100% recycled paper, this mailer is completely plastic-free. Its stackable, flat design optimizes warehouse storage space, while its rigid nature provides the security of a box with the weight efficiency of an envelope.

Key features:

- Rigid 3-Layer Construction: 3-layer E-flute carton for high impact resistance.

- Adjustable Height: Expandable border allows for products up to 4cm thick.

- Eco-Friendly Sealing: Integrated adhesive strip replaces plastic tape.

- Easy-Open Tear Strip: Designed for quick, hand-torn access by customers.

- Water Resistant (Basic): Basic moisture protection for standard transit conditions.

- Storage Optimized: Flat-folding design saves maximum storage space.