Folding shipping bag MAILmedia B4 140 g/m² with 20 mm flap — MAILmedia

Folding shipping bag MAILmedia B4 140 g/m² with 20 mm flap is a rigid envelope designed to carry B4-size documents and flat items without bending during transit. Made from 140 g/m² board, the construction delivers stiffness and protection while remaining lightweight for postal use. The 20 mm flap enables secure closure and easy sealing with adhesive tape or glue, making it suitable for routine mailings and document shipments.

Advantages

The sturdy 140 g/m² board prevents creasing and provides dimensional stability, reducing the risk of damage to printed materials or contracts. The folding design simplifies packing and allows the envelope to be prepared quickly. A 20 mm flap gives enough overlap for reliable sealing and helps keep contents in place during handling. The neutral surface is compatible with labels and postage marks.

Suitable for

• Sending B4-size documents, brochures and catalogs
• Mailing flat promotional materials and proofs
• Protecting certificates, photos and prints during transit
• Office archiving and short-term document storage

Key specifications

• Material: 140 g/m² rigid board
• Format compatibility: B4 documents and flat items
• Closure: 20 mm folding flap for sealing with tape or glue
• Construction: folding envelope for increased stiffness and protection
• Surface: printable/label-friendly finish

How to use

Insert documents flat into the envelope, ensuring the contents align with the edges to maintain protection. Fold the 20 mm flap over the opening and secure it with adhesive tape, glue or a postage seal according to postal requirements. For heavier stacks of paper, place contents centrally to avoid edge stress. Write or attach address and postage information to the surface in a clearly visible area.

Usage recommendations

For long-distance or international shipments, combine the folding shipping bag with additional external packaging or a protective sleeve to prevent moisture exposure and sharp impacts. Use clear adhesive tape along the flap edge for reinforced closure when sending multiple-page documents or important originals.